Belun Ring
BLR - 100X
Belun Ring BLR-100X 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 FDA-510(k) Class II cleared hardware & software for sleep apnea diagnosis & monitors sleep health through clinically validated AI algorithms.
Unlike other competitors in the market, Belun Ring is easy to use, affordable with medical accuracy.
Belun Ring measures
- Oxygen Saturation (SpO2)
- Pulse Rate (Beat-to-beat pulse period)
- Photoplethysmography
- Actigraphy
Powered by Belun Sleep System (BLS-100), the following results are generated
- Apnea Hypopnea Index (bAHI)
- Sleep Stages : Wake, REM, NREM (bSTAGES)
- Autonomic Nervous System (ANS) Response

Introducing Belun® Ring

World 1st FDA 510(k) cleared wearable ring using
Artificial Intelligence
for Obstructive Sleep Apnea Diagnosis with sleep stages

ISO 13485 medical devices quality management system

Taiwan FDA Class II medical-grade wearable

FDA Thailand Class III medical-grade wearable
over 20 Patents worldwide
Thinking to include Home-Sleep-Apnea Testing (HSAT) service from your clinic?
We provide a one-stop solution with an HSAT report to your inbox to walk through with your patient. Reach out for details.
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).
- 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.
- Worn at the proximal phalanx of the index finger & minimises sensor motion artifact
- Small, lightweight (14 gram) and cableless design
- Non-intrusive measurement at night
- 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
- ISO 62366-1:2015
- IEC 62133:2012
- IEC 62304:2015
- ISO 10993-1:2018
- ISO 10993-5:2009
- ISO 10993-10:2010
- ISO 80601-2-61:2017
SpO2 Parameter
- Range: 0% – 100%
- Accuracy: 70%-100%: ±2.7%, below 70%: unspecified
- Average: 8 seconds
- Data Update Period: 8 seconds
Pulse Rate Parameter
- Range: 30bpm – 250bpm
- Resolution: 1bpm
- Accuracy: ±2.5bpm or ±2% whichever is larger
- Average: Average over 8 beats
Power Source
- Internal Battery: 3.7V rechargeable lithium battery
- Charging Input: DC 5V, 700mA
Recording Time
Battery Time
- Ring can record up to 10 hours with a single charge
- Cradle can charge the Ring for ~7 nights of recording (~10 hours each)
Data Memory
- Ring can store up to 10 hours of data
- Cradle can store up to 120 hours of data
Dimension
- Ring: 44 x 60 x 18mm
- Cradle: 32 x 100 x 59mm
Weight
- Ring: ~14g
- Cradle ~97g