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©2021-2022 Belun Technology

Belun® Ring

BLR - 100C

Belun® Ring is for medical professionals that need high quality patients’ data meeting medical-standard and with 510(k) clearance from the US Food and Drug Administration (FDA).

Belun provides home sleep apnea screening & monitors sleep health through clinically validated AI algorithm.

Unlike other competitors in the market, Belun® Ring is easy to use, affordable with medical accuracy.

The Belun® Ring measures

  • Oxygen Saturation (SpO2)
  • Pulse Rate (PR)
  • Apnea Hypopnea Index (bAHI)
  • Sleep Stages : Awake, REM, NREM
  • Autonomic Nervous System (ANS) Response
  • Movement

Introducing Belun® Ring


World’s first FDA 510(k) cleared wearable ring for SpO2 measurement


ISO 13485 medical devices quality management system

over 20 Patents worldwide

Easy to use

Minimal disruptions to daily sleep routines

Clinical validation

10,000+ sleep reports worldwide from diverse ethnic backgrounds

Quick Diagnosis

3-nights sleep reports ready within 10 minutes

We provide trade solutions for professional sleep tests. Please contact us for details.

How to use?

Put the ring on before sleep. A sleep report will be generated automatically in the morning, revealing your sleep apnea risk, sleep efficiency, and stress level.

The Belun® Ring helps you discover the quality of your sleep — at home, comfortably, by simply putting on your ring before bedtime.

You will uncover the mysteries of:

  • Risk of sleep apnea
  • Sleep quality

The Belun® Ring equips its users with information that empowers them to change their daily habits — such as activities, exercise, alcohol intake, and medication — to improve their sleep health.

The Belun® Ring’s report also enables professionals to evaluate how users’ daytime activities affect sleep quality and to review sleep health holistically and scientifically in an unprecedented way in the marketplace.

All physiological data, analysis, and sleep reports can be viewed and downloaded by people from clinics, health-check centers, respiratory machine vendors, and elderly centers, which provides additional insights to physicians.

Technical Specifications

Using the spectrophotometric methodology, the Belun® Ring measures blood oxygen saturation by illuminating the skin and measuring changes in light absorption of oxygenated (oxyhemoglobin) and deoxygenated (reduced hemoglobin) blood using two light wavelengths: red and infrared. The ratio of absorbance at these wavelengths is calculated and calibrated against direct measurements of arterial oxygen saturation (SaO2) to establish the pulse oximeter’s measurement of functional oxygen saturation of arterial hemoglobin (SpO2).

  1. The sensor should be placed on the palmar side of the proximal phalanx of the index finger and along the radial artery. The accuracy of the device will be minimally affected by the skin color.
  2. Worn at the proximal phalanx of the index finger & minimises sensor motion artifact
  3. Small, lightweight (13 gram) and cableless design
  4. Non-intrusive measurement at night
  5. Multiple-night home sleep test

International standards

The Belun® Ring complies with the following international standards:

  • IEC 60601-1:2005+AMD1:2012 CSV
  • IEC 60601-1-2:2014
  • IEC 60601-1-6:2013
  • IEC 60601-1-11:2015
  • IEC 62133:2012
  • IEC 62304:2015
  • ISO 10993-1:2009
  • ISO 10993-5:2009
  • ISO 10993-10:2010
  • ISO 14971:2007
  • ISO 80601-2-61:2011

SpO2 Parameter

Range: 0% – 100%
Resolution: 1%
Accuracy: 70%-100%: ±2%, below 70%: unspecified

Pulse Rate Parameter

Range: 30bpm – 250bpm
Resolution: 1bpm
Accuracy: ±2bpm or ±2% whichever is larger

Power Source

Internal Battery: 3.7V rechargeable lithium battery
Charging Input: DC 5V


Ring: 45 x 60 x 20mm
Cradle: 60 x 140 x 60mm


Ring: ~13gram
Cradle ~177gram