MARKET INSIGHTS

The global handheld vascular Dopplers market size was valued at USD 1.76 billion in 2025. The market is projected to grow from USD 1.84 billion in 2026 to USD 2.69 billion by 2034, exhibiting a CAGR of 4.8% during the forecast period.

Handheld vascular Dopplers are portable, non-invasive medical devices that utilize the Doppler effect to assess blood flow by detecting and audibly representing the movement of red blood cells. These instruments are crucial for evaluating peripheral vascular conditions, such as peripheral arterial disease (PAD) and deep vein thrombosis (DVT), as well as for fetal heart rate monitoring. The device typically includes a probe with a piezoelectric crystal that transmits and receives ultrasound waves, providing real-time feedback on vascular patency and hemodynamics.

The market is experiencing steady growth, primarily driven by the rising global prevalence of vascular diseases, which is strongly correlated with an aging population and increasing rates of diabetes and obesity. The World Health Organization estimates that cardiovascular diseases are the leading cause of death globally, taking an estimated 17.9 million lives each year. The shift towards point-of-care diagnostics and the growing demand for portable, cost-effective medical equipment in both clinical and homecare settings are also significant contributors. However, market expansion faces headwinds from the high cost of advanced devices and the growing adoption of more comprehensive duplex ultrasound systems in well-funded healthcare facilities.

MARKET DYNAMICS

MARKET DRIVERS

Rising Global Burden of Vascular Diseases to Propel Market Demand

The escalating prevalence of vascular disorders worldwide is a primary catalyst for the handheld vascular Doppler market. Conditions such as peripheral arterial disease (PAD), deep vein thrombosis (DVT), and venous insufficiency are becoming increasingly common, driven by aging populations and lifestyle factors. For instance, it is estimated that over 200 million people globally are affected by PAD, with prevalence rising sharply in individuals over 70. This creates a substantial and growing patient pool requiring regular vascular assessment. Handheld Dopplers offer a critical first-line, non-invasive tool for screening and monitoring these conditions, especially in primary care and outpatient settings where quick, point-of-care diagnostics are essential. The ability to perform rapid ankle-brachial index (ABI) measurements or detect venous reflux with a portable device directly translates to earlier intervention and better patient management, thereby fueling consistent market growth.

Technological Advancements and Product Innovation to Accelerate Adoption

Continuous technological evolution is a significant driver, making handheld vascular Dopplers more accurate, user-friendly, and versatile. Recent innovations include the integration of color display screens, wireless connectivity for data transfer to electronic health records, and enhanced battery life. Furthermore, the development of probes with multiple frequencies (like 4 MHz, 8 MHz, and 10 MHz) in a single compact unit allows clinicians to assess both deep and superficial vessels without switching devices. These advancements reduce examination time and improve diagnostic confidence. The trend towards miniaturization and rugged, durable designs also expands their use in diverse environments, from hospital wards to remote clinics and even in home healthcare. As manufacturers focus on creating intuitive devices that require minimal training, the barrier to adoption lowers, encouraging broader utilization across various healthcare tiers.

Growing Emphasis on Point-of-Care Diagnostics and Cost-Effective Triage

The global shift towards decentralized and value-based healthcare is powerfully driving the demand for point-of-care diagnostic tools like handheld Dopplers. In an era where reducing hospital readmissions and optimizing clinic workflow are paramount, these devices enable immediate vascular assessment at the patient's bedside. This is particularly valuable in emergency departments for ruling out DVT or in diabetic foot clinics for assessing circulation. By providing instant results, they facilitate faster clinical decision-making, potentially avoiding more expensive and time-consuming imaging studies like duplex ultrasound in straightforward cases. The economic argument is strong; a handheld Doppler represents a relatively low capital investment compared to large, fixed ultrasound systems, making it an accessible technology for smaller practices and emerging markets. This cost-effectiveness, combined with clinical utility, ensures its position as a staple in modern vascular assessment.

➤ For instance, leading manufacturers are now incorporating advanced software algorithms that provide visual waveform analysis and automated calculations on the device screen, moving beyond simple audio feedback to offer more quantitative data at the point of care.

Furthermore, supportive guidelines from vascular societies recommending routine vascular screening for high-risk populations, coupled with increasing healthcare expenditure in developing regions, are anticipated to sustain market momentum over the forecast period.

MARKET CHALLENGES

Limitations in Diagnostic Depth and Accuracy Compared to Standard Ultrasounds

While handheld vascular Dopplers are excellent for screening and basic triage, they face inherent technical challenges that limit their use as definitive diagnostic tools. The primary limitation is their inability to provide anatomical imaging. Unlike standard duplex ultrasound systems, a handheld Doppler only delivers auditory or basic waveform data about blood flow velocity and direction. It cannot visualize the vessel wall, identify plaque morphology, or measure stenosis precisely. This lack of imaging can lead to false positives or negatives, particularly in complex cases or obese patients where signal acquisition is difficult. Consequently, findings from a handheld device often require confirmation with a full vascular duplex scan, which can create workflow redundancies. This dependency on more advanced imaging for final diagnosis acts as a ceiling for the technology's expansion into more comprehensive diagnostic roles.

Other Challenges

Operator Dependence and Variability

The accuracy of a handheld Doppler examination is highly dependent on the skill and experience of the operator. Proper probe positioning, angle correction, and interpretation of auditory signals are subjective. Inconsistent technique can lead to significant variability in measurements like the Ankle-Brachial Index (ABI), where studies have shown inter-operator differences can affect clinical decisions. This reliance on user expertise poses a challenge for standardization across different healthcare settings and can deter adoption in environments without specifically trained personnel.

Competition from Advanced Portable Ultrasound Systems

The rapid advancement of compact, handheld ultrasound devices that offer both Doppler and B-mode imaging presents a competitive challenge. These all-in-one devices, while often more expensive, provide significantly more diagnostic information. As their prices gradually decrease and their usability improves, they may start to encroach on the market segment traditionally served by simple audio Dopplers, particularly in specialties where imaging is crucial. This technological convergence pressures dedicated handheld Doppler manufacturers to innovate continuously to justify their product's standalone value.

MARKET RESTRAINTS

Stringent Regulatory Frameworks and Reimbursement Hurdles to Deter Market Growth

The medical device industry operates within a complex web of regional regulatory approvals, and handheld vascular Dopplers are no exception. Obtaining clearances from bodies like the U.S. FDA or the European CE mark requires substantial investment in clinical validation, quality management systems, and documentation. This process is time-consuming and costly, particularly for smaller manufacturers or for new entrants with innovative features. Moreover, the reimbursement landscape for procedures using these devices is often ambiguous or inadequate. In many healthcare systems, reimbursement codes for vascular testing may not differentiate between a simple handheld Doppler exam and a more comprehensive duplex study, potentially disincentivizing providers from investing in or utilizing the handheld technology for billable services. This financial uncertainty can slow down market penetration and adoption rates.

Market Saturation and Price Sensitivity in Mature Regions

In well-established healthcare markets such as North America and Western Europe, the handheld vascular Doppler market is relatively mature. Replacement sales and upgrades for existing devices constitute a significant portion of demand, while the rate of new unit penetration into first-time buyer segments has slowed. This saturation leads to intense price competition among manufacturers, squeezing profit margins. Furthermore, procurement decisions in large hospital networks and group purchasing organizations (GPOs) are increasingly driven by cost-containment pressures. While this benefits buyers, it forces manufacturers to compete primarily on price, potentially at the expense of R&D investment for next-generation features. This environment makes it challenging to sustain high growth rates in these core markets.

Lack of Awareness and Training in Underserved and Emerging Markets

While emerging economies represent a significant growth opportunity due to large patient populations and improving healthcare infrastructure, they also present a major restraint: a lack of widespread awareness and training. In many low- and middle-income countries, vascular diseases are under-diagnosed, and the utility of basic vascular screening tools is not fully recognized across all levels of healthcare providers. There is often a shortage of personnel trained to perform and interpret Doppler examinations effectively. Without concerted efforts in professional education and demonstration of clinical value, the adoption of this technology can remain sporadic and limited to urban tertiary care centers. Overcoming this educational gap requires significant investment from both public health bodies and private companies, which can slow down market expansion in these high-potential regions.

MARKET OPPORTUNITIES

Expansion into Home-Based Care and Remote Patient Monitoring

The accelerating trend towards telehealth and home healthcare opens a transformative opportunity for handheld vascular Dopplers. With the proliferation of connected health platforms, there is potential to develop smart Dopplers that can record waveforms and transmit data securely to a clinician for remote review. This would be revolutionary for managing chronic conditions like PAD or venous ulcers, allowing for frequent monitoring without requiring clinic visits. Patients at high risk for DVT post-surgery could be monitored at home, improving compliance and outcomes. The integration of such devices into remote patient monitoring (RPM) programs, which are gaining reimbursement support in several countries, creates a new and scalable market segment beyond traditional clinical settings.

Strategic Focus on Emerging Economies with Untapped Potential

Emerging markets in Asia-Pacific, Latin America, and parts of Africa represent the most significant blue-ocean opportunity. Healthcare infrastructure in these regions is expanding, and governments are increasingly focusing on combating non-communicable diseases, including vascular disorders. The relatively low cost and portability of handheld Dopplers make them ideally suited for screening programs in rural and semi-urban areas where access to advanced imaging is limited. Manufacturers that develop rugged, easy-to-use, and cost-optimized products for these markets, coupled with local training initiatives, can capture first-mover advantage. The patient population is vast; for example, the diabetic population in Asia is projected to exceed 200 million, all of whom are at high risk for vascular complications, indicating a sustained long-term demand for basic vascular assessment tools.

Integration with Artificial Intelligence and Data Analytics Platforms

The next frontier for handheld vascular Dopplers lies in software and data services. Embedding artificial intelligence (AI) algorithms into devices or companion apps can mitigate the challenge of operator dependence by providing automated waveform analysis, quality checks, and preliminary interpretations. This could standardize outputs and support less-experienced users. Furthermore, aggregating anonymized data from thousands of devices can provide valuable insights into population vascular health trends, treatment efficacy, and disease progression. Manufacturers can evolve from being purely hardware providers to offering comprehensive vascular health management solutions, creating recurring revenue streams through software subscriptions and data analytics services for healthcare providers and payers.

➤ For instance, partnerships between medical device companies and digital health tech firms are already exploring platforms where Doppler data is seamlessly integrated with other patient vitals to create a holistic cardiovascular risk profile, enabling proactive care management.

Additionally, the growing focus on preventive healthcare and wellness screening in corporate and retail clinic settings presents a novel commercial avenue for quick vascular health checks, further diversifying the application base for this technology.

Segment Analysis:

By Product Type (Frequency)

8 MHz Segment is the Market Standard, Offering Optimal Balance of Penetration and Resolution for Peripheral Vascular Assessment

The market is segmented based on the operating frequency of the device, which determines its clinical application depth and target vessel size. The primary segments are:

• 4 MHz and Below (Low Frequency)

  • Subtypes: 2 MHz, 3 MHz probes

• 8 MHz (Mid Frequency)

• 10 MHz and Above (High Frequency)

  • Subtypes: 10 MHz, 12 MHz, and others for superficial vessels

• Multi-Frequency / Adjustable Devices

By Technology

Continuous Wave (CW) Doppler Devices Hold Significant Share for Their Simplicity and Effectiveness in Detecting Blood Flow

The market is segmented based on the underlying Doppler technology, which impacts functionality, cost, and clinical use case.

• Continuous Wave (CW) Doppler

• Pulsed Wave (PW) Doppler

• Bidirectional Doppler (indicating flow direction)

• Others (e.g., devices with integrated waveform analysis)

By Application

Peripheral Vascular Assessment is the Dominant Application Driven by High Prevalence of Venous Insufficiency and Arterial Disease

The market is segmented based on primary clinical applications in point-of-care settings.

• Peripheral Vascular Assessment (Arterial & Venous)

• Obstetrics and Gynecology (Fetal Heart Tone Monitoring)

• Anesthesiology (Vascular Access)

• Emergency Medicine & Triage

• Other (e.g., veterinary medicine, sports medicine)

By End User

Hospitals Remain the Largest End-User Segment Due to High Patient Volume and Diverse Clinical Departments Utilizing the Technology

The market is segmented based on the primary purchasing and utilization centers.

• Hospitals (Inpatient & Outpatient Departments)

• Clinics and Ambulatory Surgical Centers (ASCs)

• Home Care Settings

• Academic and Research Institutions

COMPETITIVE LANDSCAPE

Key Industry Players

Innovation and Strategic Positioning Drive Market Leadership

The competitive landscape of the global handheld vascular Dopplers market is moderately fragmented, characterized by the presence of several established medical device companies and specialized manufacturers. While no single player dominates the market, a few key companies have carved out significant shares through brand reputation, technological innovation, and extensive distribution networks. The market's growth, projected within the broader US$ 603 billion medical devices sector, is attracting both sustained investment from incumbents and new entrants aiming to capitalize on the rising demand for point-of-care diagnostic tools.

Koven Technology and Newman Medical are recognized as prominent players, particularly in North America and Europe. Their leadership is attributed to a long-standing presence in the vascular access and diagnostics space, offering a range of Doppler models with varying frequencies (4 MHz, 8 MHz, 10 MHz) to cater to different clinical depths and applications. These companies have built strong relationships with hospital procurement departments and clinic networks, which is a critical success factor in this B2B-oriented market.

Meanwhile, companies like Edan Instruments and Viatom by Lepu are strengthening their global footprint by leveraging cost-effective manufacturing and aggressive marketing in emerging Asia-Pacific markets. Their growth strategy often involves offering competitively priced, feature-rich devices that appeal to cost-conscious healthcare providers in regions with expanding healthcare infrastructure. Furthermore, Natus Medical Incorporated benefits from its broader portfolio of neurology and newborn care products, allowing for cross-selling opportunities and bundled solutions within hospital settings.

The competitive intensity is further fueled by continuous product development. Players are increasingly integrating advanced features such as color LCD screens, rechargeable battery systems, data storage capabilities, and enhanced audio output to differentiate their offerings. Recent developments also show a trend towards wireless connectivity and compatibility with electronic health records (EHR), a move led by companies aiming to position their devices as part of the digital healthcare ecosystem. Strategic activities such as mergers, acquisitions, and exclusive distribution agreements are common as companies strive to expand their geographical reach and fill portfolio gaps without the lead time of internal R&D.

List of Key Handheld Vascular Doppler Companies Profiled

• Koven Technology (U.S.)

• Newman Medical (U.S.)

• Natus Medical Incorporated (U.S.)

• Remington Medical (U.K.)

• Huntleigh Healthcare Limited (U.K.)

• MedaSonics, Inc. (U.S.)

• Hadeco, Inc. (U.S.)

• Edan Instruments, Inc. (China)

• Bistos Co., Ltd. (South Korea)

• Viatom by Lepu Medical (China)

• Gima S.p.A. (Italy)

• Braun & Co. Limited (New Zealand)

• Ultrasound Technologies Ltd. (Israel)

HANDHELD VASCULAR DOPPLERS MARKET TRENDS

Integration of Wireless Connectivity and Smart Features to Emerge as a Dominant Trend

The handheld vascular Doppler market is undergoing a significant transformation, driven by the integration of wireless connectivity and smart device compatibility. This evolution is moving the market beyond traditional standalone devices towards connected health ecosystems. Modern devices now frequently feature Bluetooth and Wi-Fi capabilities, enabling seamless transfer of blood flow audio and waveform data to smartphones, tablets, and hospital information systems. This connectivity facilitates remote patient monitoring, easier data storage for longitudinal studies, and streamlined reporting, which is particularly valuable in managing chronic conditions like peripheral arterial disease (PAD) and venous insufficiency. The trend is further accelerated by the proliferation of companion mobile applications that can visualize Doppler signals, record notes, and even apply preliminary algorithmic analysis. This shift not only enhances clinical workflow efficiency but also supports the broader movement towards telemedicine and decentralized care, allowing for preliminary vascular assessments in home care or primary care settings before specialist referral. The demand for these intelligent, connected devices is rising as healthcare systems globally prioritize cost-effective outpatient management and digital health integration.

Other Trends

Expansion into Point-of-Care and Primary Care Settings

There is a pronounced trend of handheld vascular Dopplers expanding from their traditional stronghold in vascular surgery and specialist clinics into broad-based point-of-care and primary care applications. This is largely due to the growing emphasis on early detection and preventive screening for cardiovascular and peripheral vascular diseases. Given the rising global burden of diabetes and obesity key risk factors for vascular complications primary care physicians and podiatrists are increasingly adopting these devices for routine pedal pulse checks and ankle-brachial index (ABI) screenings. The market is responding with devices that are more user-friendly, intuitive, and require less specialized training to operate effectively. Furthermore, the development of multi-frequency probes in a single, compact unit allows a generalist to assess both deep and superficial vessels without needing multiple devices. This democratization of vascular assessment technology is a key growth vector, opening vast new customer segments beyond hospital-based specialists and directly contributing to market expansion.

Technological Advancements in Probe Design and Battery Life

Continuous refinements in transducer probe technology and ergonomics represent a core, sustained trend. Manufacturers are focusing on improving sensitivity and signal clarity in challenging patients, such as those with edema or obesity, through advanced crystal materials and noise-reduction algorithms. Concurrently, there is a strong push towards enhancing device portability and durability, which is intrinsically linked to battery technology. The market is seeing a shift from standard alkaline batteries to long-lasting, rechargeable lithium-ion power sources, with some modern devices offering over 10 hours of continuous operation on a single charge. This is critical for clinicians performing extended rounds or working in resource-limited settings without immediate access to power. Additionally, ergonomic design improvements such as lighter weight, better grip, and more intuitive button layouts reduce user fatigue and improve examination accuracy. These advancements, while incremental, are vital for user adoption and satisfaction, ensuring that the devices are reliable tools in daily clinical practice rather than technological novelties.

Regional Analysis: Handheld Vascular Dopplers Market

North America

The North American market, led by the United States, is characterized by a mature healthcare infrastructure and high adoption rates of advanced medical technologies. This region is a significant revenue generator for the Handheld Vascular Dopplers market, driven by a high prevalence of peripheral vascular diseases (PVD) and diabetes, coupled with a large, aging population. The U.S. Centers for Disease Control and Prevention (CDC) estimates that approximately 6.5 million adults aged 40 and older in the U.S. have PVD. Stringent regulatory frameworks from the U.S. Food and Drug Administration (FDA) ensure high product standards, which, while increasing compliance costs, bolster clinician confidence and market value. Furthermore, the shift towards point-of-care diagnostics in outpatient clinics and home healthcare settings is expanding the user base beyond traditional hospital vascular labs. The presence of key market players and a strong culture of clinical training and certification in vascular assessment further solidify North America's position as a leader in both innovation and consumption of high-end, feature-rich devices.

Europe

Europe represents another highly developed market, underpinned by robust public healthcare systems, universal health coverage in many nations, and a strong emphasis on preventive care. The region's growth is fueled by a rapidly aging demographic; the European Commission projects that by 2030, people aged 65 and over will make up more than 20% of the EU population, directly increasing the incidence of cardiovascular and vascular conditions. The European market is highly receptive to technologically advanced, portable, and user-friendly Dopplers that facilitate efficient bedside and community-based assessments. However, market dynamics are heavily influenced by the centralized procurement processes of national health services, such as the UK's NHS, which prioritize cost-effectiveness and value-based purchasing. This environment encourages competition among manufacturers to offer reliable devices at competitive price points. Additionally, the EU's Medical Device Regulation (MDR) imposes rigorous clinical evaluation and post-market surveillance requirements, ensuring high safety standards but also creating a higher barrier to entry for new products.

Asia-Pacific

The Asia-Pacific region is the fastest-growing market for Handheld Vascular Dopplers, driven by explosive economic development, rising healthcare expenditure, and increasing awareness of vascular health. China and India are the primary engines of this growth, owing to their massive populations, expanding middle class, and significant government investments in healthcare infrastructure. For instance, China's "Healthy China 2030" initiative aims to improve healthcare access and quality, directly boosting demand for diagnostic devices. The market here is bifurcated: there is strong demand for cost-effective, basic Doppler units in tier-2 and tier-3 cities and rural clinics, while major metropolitan hospitals are rapidly adopting advanced, digital devices with spectral analysis capabilities. Local manufacturers are gaining substantial market share by offering competitively priced products, though international brands are still preferred for high-end applications. The growing burden of lifestyle diseases like diabetes, which affects over 77 million adults in India according to the International Diabetes Federation, is a critical, long-term demand driver. However, market penetration faces challenges, including price sensitivity, fragmented distribution channels, and varying levels of clinical expertise across the vast region.

South America

The South American market for Handheld Vascular Dopplers is in a growth phase, characterized by increasing healthcare modernization efforts but constrained by economic and political volatility. Countries like Brazil and Argentina have large patient populations and developing healthcare networks that create a steady demand for essential diagnostic tools. The high prevalence of conditions such as Chagas disease, which can lead to cardiovascular complications, also underpins specific clinical need. Public healthcare systems are major purchasers, but budgets are often limited, making low-to-mid-range priced devices the most sought-after. Private hospitals and specialty clinics in urban centers are the primary adopters of more advanced models. Market growth is inconsistent, heavily tied to national economic cycles and government healthcare spending. While regulatory bodies like ANVISA in Brazil provide oversight, enforcement and standardization can be uneven compared to North America or Europe. Nonetheless, the region presents a significant opportunity for growth, especially for manufacturers with flexible pricing strategies and strong local distribution partnerships.

Middle East & Africa

This region presents a highly diverse and emerging market landscape. The Gulf Cooperation Council (GCC) countries, such as Saudi Arabia, the UAE, and Qatar, are high-value markets driven by government-led healthcare expansion, a high prevalence of diabetes, and a focus on establishing world-class medical tourism hubs. These nations prefer premium, technologically advanced medical devices from international manufacturers. In contrast, much of Africa faces significant challenges, including underfunded public health systems, a shortage of trained personnel, and limited healthcare access in rural areas. Demand here is primarily for ultra-durable, simple-to-use, and low-cost Doppler devices for basic vascular screening. Initiatives by non-governmental organizations and international health bodies to combat diseases like diabetes and hypertension are slowly increasing device adoption. Overall, the MEA region is one of long-term potential, with growth heavily dependent on economic diversification in oil-rich states and sustained international investment in healthcare infrastructure across the broader continent. The market is nascent but evolving, with a clear dichotomy between high-tech demand in affluent areas and essential need in developing nations.

Handheld Vascular Dopplers Market Research Report

Report Scope

This market research report offers a holistic overview of global and regional markets for the forecast period 2025–2032. It presents accurate and actionable insights based on a blend of primary and secondary research.

Key Coverage Areas:

• ✅ Market Overview

  • Global and regional market size (historical & forecast)

  • Growth trends and value/volume projections

• ✅ Segmentation Analysis

  • By product type or category

  • By application or usage area

  • By end-user industry

  • By distribution channel (if applicable)

• ✅ Regional Insights

  • North America, Europe, Asia-Pacific, Latin America, Middle East & Africa

  • Country-level data for key markets

• ✅ Competitive Landscape

  • Company profiles and market share analysis

  • Key strategies: M&A, partnerships, expansions

  • Product portfolio and pricing strategies

• ✅ Technology & Innovation

  • Emerging technologies and R&D trends

  • Automation, digitalization, sustainability initiatives

  • Impact of AI, IoT, or other disruptors (where applicable)

• ✅ Market Dynamics

  • Key drivers supporting market growth

  • Restraints and potential risk factors

  • Supply chain trends and challenges

• ✅ Opportunities & Recommendations

  • High-growth segments

  • Investment hotspots

  • Strategic suggestions for stakeholders

• ✅ Stakeholder Insights

  • Target audience includes manufacturers, suppliers, distributors, investors, regulators, and policymakers

FREQUENTLY ASKED QUESTIONS:

What is the current market size of Global Handheld Vascular Dopplers Market?

-> The global handheld vascular Dopplers market was valued at an estimated USD 120.5 million in 2024 and is projected to reach USD 185.2 million by 2032, growing at a CAGR of approximately 5.5% during the forecast period.

Which key companies operate in Global Handheld Vascular Dopplers Market?

-> Key players include Koven Technology, Newman Medical, Natus Medical Inc., Huntleigh, Edan Instruments, and Hadeco, Inc., among others.

What are the key growth drivers?

-> Key growth drivers include the rising global prevalence of vascular diseases like PAD and DVT, the expanding geriatric population, increasing demand for point-of-care diagnostics, and technological advancements enhancing device portability and accuracy.

Which region dominates the market?

-> North America holds the largest market share, driven by advanced healthcare infrastructure, while the Asia-Pacific region is the fastest-growing market due to improving healthcare access and rising medical investments.

What are the emerging trends?

-> Emerging trends include the integration of Bluetooth connectivity for data transfer, development of hybrid devices with color display, increased focus on battery life and durability, and the expansion of telemedicine applications for remote patient monitoring.