The O2RingS fits most adult fingers with a circumference of 55.24 to 80 mm (about 2.17 to 3.15 inches). Its flexible ring design ensures comfort without pressure or numbness, even when worn overnight.
O2Ring-S
Smart Ring Pulse Oximeter
Keeps track of your blood oxygen all night and alerts you if it drops too low.
☑ Checks your blood oxygen and heart rate every second.
☑ Vibration alerts for low blood oxygen or abnormal pulse rate.
☑ Wake up to easy-to-read reports you can trust, share, or bring to your doctor.
O2Ring-S Smart Ring Pulse Oximeter
Keeps track of your blood oxygen all night and alerts you if it drops too low.
Checks your blood oxygen and heart rate every second.
Vibration alerts for low blood oxygen, abnormal pulse rate
Wake up to detailed, easy-to-read reports you trust and share.
Unmatched Accuracy.
Uninterrupted Sleep Confidence.
Smart O2RingS takes overnight oxygen tracking to
a whole new level
— not just in tech, but in how it feels to use.
Accurate Oxygen Tracking.
Comfortable Sleep, All Night.
Clinician Review
O2Ring-S vs. Hospital Monitor
Mikey M. / Baptist Health
Pretty spot on O2-S Ring Have to admit. Thought it was going to be a gimmick, but I was recently monitored for a study and decided to put the ring against what the clinic used. Both gave me the same results, both O2 and pulse. Only difference, the clinic only take its every hour, while the ring I have to give me a telemetry every second. Accuracy was very spot on with the clinics.
It was hospital setting, they used duck bill typical cart o2 meter with pulse and BP every hour, 6 hours or hour. Finger used was thumb on my Wellue o2 Ring and hospital duck bill on index. Welllue provided immediate results while hospitals duck bill took a few tries to get a reading.
An Improved O2Ring for Overnight Oxygen Tracking
If you loved the original O2Ring, you’ll love the more powerful O2RingS.
We made upgrades in accuracy, ease of use, and more stable readings, all while keeping what made O2Ring so popular.
Data Readings
Improved signal filtering, more stable and accurate readings
Accurate readings, standard filtering
Storage Interval
1s
4s
Continuous Tracking Duration
Up to 24 hours
Up to 16 hours
Charging Port
Type-C
Micro USB
Keeps an Eye on Your Oxygen While You Sleep
If your oxygen drops below the level you set, O2Ring-S gently vibrates on your finger to alert you.
You can adjust the vibration strength to match what feels right for you, from subtle to more noticeable.
The alert feels more like a soft nudge than a loud or stressful alarm.
It may prompt you to shift position or check your CPAP without fully waking you.
Designed to help you notice breathing changes during sleep in a calm, non-disruptive way.
Simple Reports You Can Understand
In the morning, you’ll see a clear report of your overnight oxygen levels.
The sleep analysis will highlight periods of low oxygen, calculate overnight SpO2 averages, and may even help you notice potential apnea events by correlating oxygen drops with your movement or pulse changes.
Designed to Stay Accurate Even When You Move or Turn in Bed
With an upgraded chip and a larger battery, O2Ring-S is able to handle more data more consistently throughout the night.
This allows the ring to stay steady and reliable, even when you change positions during sleep. Small, meaningless fluctuations are filtered out, so you are not disturbed by unnecessary alerts.
When something truly needs your attention, the ring notifies you.
See What’s Happening, Second by Second.
The upgraded hardware allows O2Ring-S to record your oxygen and pulse every second. By capturing more real data more often, it provides a clearer picture of what happens during your sleep.
You can review a second-by-second report on your phone or computer, and share it if needed. This makes it easy to understand overnight trends and notice brief changes that might otherwise be missed.
An Improved O2Ring
for Overnight Oxygen Tracking
If you loved the original O2Ring, you’ll love the more powerful O2RingS.
We made upgrades in accuracy, ease of use, and more stable readings — all while keeping what made O2Ring so popular.
Data Readings
Improved signal filtering, more stable readings
Accurate readings, standard filtering
Storage Interval
1s
4s
Continuous Tracking Duration
Up to 24 hours
Up to 16 hours
Charging Port
Type-C
Micro USB
Designed to Stay Accurate
Even When You Move or Turn in Bed
Next-Gen Algorithm
With an upgraded chip and a larger battery, O2Ring-S is able to handle more data more consistently throughout the night.
This allows the ring to stay steady and reliable, even when you change positions during sleep. Small, meaningless fluctuations are filtered out, so you are not disturbed by unnecessary alerts.
When something truly needs your attention, the ring notifies you.
Gentle Vibration Alarm
Support for Troubled Breathing
Customize Vibration
If your oxygen drops below the level you set, O2Ring-S gently vibrates on your finger to alert you.
You can adjust the vibration strength to match what feels right for you, from subtle to more noticeable.
The alert feels more like a soft nudge than a loud or stressful alarm. It may prompt you to shift position or check your CPAP without fully waking you.
See What’s Happening, Second by Second.
Stable 1-Second Readings
The upgraded hardware allows O2Ring-S to record your oxygen and pulse every second. By capturing more real data more often, it provides a clearer picture of what happens during your sleep.
You can review a second-by-second report on your phone or computer, and share it if needed. This makes it easy to understand overnight trends and notice brief changes that might otherwise be missed.
Simple Reports You Can Understand
In the morning, you’ll see a clear report of your overnight oxygen levels.
The sleep analysis will highlight periods of low oxygen, calculate overnight SpO2 averages, and may even help you notice potential apnea events by correlating oxygen drops with your movement or pulse changes.
This level of detail can help you understand
Real-time Monitoring
if your therapy is truly effective
For example, if your oxygen level stays nice and steady all night, your CPAP is doing its job.
If you see recurring drops below, say, 91%, it might be time to adjust your mask or pressure.
Research-Grade Data
For those who want deeper insight, O2Ring-S uses a high sampling rate to collect detailed sleep data at home.
Some users choose to review this information closely to better understand their own sleep patterns over time.
Real-time Monitoring
This level of detail can help you understand
if your therapy is truly effective
For example, if your oxygen level stays nice and steady all night, your CPAP is doing its job.
If you see recurring drops below, say, 91%, it might be time to adjust your mask or pressure.
Research-Grade Data
For those who want deeper insight, O2Ring-S uses a high sampling rate to collect detailed sleep data at home.
Some users choose to review this information closely to better understand their own sleep patterns over time.
One Adjustable Size That Fits Most Fingers
The flexible ring fits finger sizes from 55 mm to 80 mm (2.17" to 3.15") and stays comfortably in place without slipping or pinching.
You can wear it on different fingers, and finger choice does not affect accuracy.
Use It Anytime, Anywhere
Beyond sleeping, you can wear it during meditation or at work for spot checks or all-day tracking.
Feather Light
Weighs just 17 grams with no cables to get in the way. So comfortable that many users forget they’re wearing it.
Upgraded Battery Life
Up to 3 Nights per Charge
Powered by a higher-capacity battery, O2Ring-S runs longer between charges.
One full charge can last up to three full nights of overnight monitoring.
That means you only need to charge it about once every 3 days.
With a universal USB-C port, you can charge it using your laptop, a power bank, or any standard USB-C cable for everyday convenience.
Works Straight Out of the Box
O2Ring-S works on its own, with built-in memory that stores up to four nights of sleep data.
Just put it on before bed and let it track your sleep overnight. The next day, your data syncs automatically to the free mobile app or to the PC software when you connect.
There’s no complicated setup and no need to stay connected to Bluetooth all night.
Real Stories, Real Impact
Jim Joy
"I didn’t think my wife’s CPAP was working properly. I asked her to wear the Wellue pulse oxygen ring I had bought to spot check my CPAP. A half hour after lights out I woke up with her slapping her hand. I asked what’s wrong? She said this ring thing keeps buzzing. I told her BREATH! It has spiked down to 85% oxygen. I ordered a new auto pressure CPAP (APAP) and used the oxygen sensor ring to dial in the minimum and maximum pressure to keep her above 92%. That included going to a full nose and mouth mask. Data is better than hoping."
Becky Dierks Reuss
"Currently using this & it WORKS! I failed CPAP & BiPAP. Using Alterna oral device and at 5 weeks this oximetry ring…It does not disrupt my sleep. Very user friendly! Got a report after first week of use from company."
Melody Cheeseman Diehl
"I love my ring! Being on oxygen 24/7 after COVID I depend on my ring to wake me when I lose my cannula while sleeping. I also wear at times (like outside gardening) just to check I that I am not overdoing and still at a good level. Best thing I have found"
Carol Jurca
"It’s a real investment in my health. I didn’t know my oxygen levels were getting so low, down to 80%! I would have never known this unless I was being monitored. For me, it’s money well spent."
Lise MacLeod
"This works really well. It puts a detailed record on your phone that you can study and share. It can be set to ring or vibrate to alert you when your oxygen level is low, so you can take some deep breaths."
Martha Hudson
"I love mine. When O2 drops into the 80%, the ring buzzes me to wake up to breath and 02 goes right back up."
Lyle Shakespear
"The ring stays on and is fairly comfortable. It records data essentially non-stop all night and provides a nice report showing my numbers throughout the night. I'm able to see oxygen levels for the whole night as well as a count of the number of oxygen level drops I had."
Victor Wardle
"Works very well. It does link in with their app easily which can then be exported to other applications.
Fits nicely and not an encumberance."
Specifications
- PHYSICAL DETAILS
- SPO2 & PR PARAMETER
- WHAT'S IN THE BOX
Fits Finger Circumference
55 mm – 80 mm (2.17" – 3.15")
Weight
0.6 oz / 17g
Device Dimensions
38mm x 30mm x 38mm (1.5'' x 1.2'' x 1.5'')
Degree of Dust & Water Resistance
IP22
Battery Life
Rechargeable lithium-polymer, 3.7 Vdc; 24 hours for typical use
Charge Time
3 hours
Wireless
Bluetooth 4.0 BLE
Built-In Memory
4 sessions, up to 10 hours for each session
Recorded Parameters
Oxygen level, pulse rate, motion
Oxygen Level Range
70%-100%
Pulse Rate Range
30 to 250 bpm
SpO2 Accuracy
80%-99%: ±2% 70%-79%: ±3%
Pulse Rate Accuracy
±2bpm or ±2%
Measure Interval
1S
Data Display Interval in App
1S
Compatible Computer System
Windows 7/8/10/11;
macOS 10.15.3 or later
Works With
iOS 9.0 or later, iPhone 4s/iPad 3 or later;
Android 5.0 or later, with Bluetooth 4.0 BLE
Wellue® O2Ring™ S Smart Ring Pulse Oximeter
Type-C cable
User guide
Frequently Asked Questions
What finger sizes does the O2RingS fit?
Which finger should I wear the O2RingS on?
Choose a finger that offers a snug, comfortable fit—neither too tight nor too loose. Since finger size and shape vary, try different fingers to find the most secure placement for accurate SpO2 and heart rate tracking.
What’s the difference between O2Ring and O2RingS?
O2RingS is the upgraded version with:
→ More stable & accurate readings (200Hz sampling + next-gen algorithm)
→ Longer battery life: 24 hours of continuous tracking
→ USB-C charging: more convenient
→ Higher-resolution data: 1-second interval recordings
Will it fall off during sleep?
The flexible, medical-grade silicone ring is designed to fit snugly and stay securely in place, even during overnight use.
Does O2RingS require a subscription to access O2 scores or other features?
No, O2RingS doesn’t require a subscription. All core features — including real-time oxygen tracking, detailed reports, O2 scores, trend graphs, and data export — are completely free to use.
Does it work without an internet connection?
Yes. The O2RingS does not require Wi-Fi or mobile data to function. It stores data locally and syncs via Bluetooth when connected to the app.
Reviews, Q&A
Free Shipping
We offer free shipping for O2RingS internationally. For countries and regions we can deliver to, the referenced transit time is 2-8 business days.
You can track your order status anytime here https://getwellue.com/pages/track-order. Please feel free to contact us if you have any questions or concerns.
30-Day Money Back Guarantee
At any time within 30 days of receiving your order, you are not 100% satisfied, you may return it to us for a refund.
If you bought the product from www.getwellue.com, you can return it to us. Your payment card will be credited upon receipt of the returned merchandise. Any items damaged due to reasons not covered under warranty cannot be accepted back for refund under our 30 Day Money Back Guarantee.
If you are sure you want to return the goods, please contact us at first at support@getwellue.com. We provide 24/7 ticket and email support. Please contact us if you need assistance.
You May Also Like
O2Ring-S Smart Ring Pulse Oximeter
Keeps track of your blood oxygen all night and alerts you if it drops too low.
Checks your blood oxygen and heart rate every second.
Vibration alerts for low blood oxygen, abnormal pulse rate
Wake up to detailed, easy-to-read reports you trust and share.
Accurate Oxygen Tracking.
Comfortable Sleep, All Night.
Clinician Review
O2Ring-S vs. Hospital Monitor
Mikey M. / Baptist Health
Pretty spot on O2-S Ring Have to admit. Thought it was going to be a gimmick, but I was recently monitored for a study and decided to put the ring against what the clinic used. Both gave me the same results, both O2 and pulse. Only difference, the clinic only take its every hour, while the ring I have to give me a telemetry every second. Accuracy was very spot on with the clinics.
More
It was hospital setting, they used duck bill typical cart o2 meter with pulse and BP every hour, 6 hours or hour. Finger used was thumb on my Wellue o2 Ring and hospital duck bill on index. Welllue provided immediate results while hospitals duck bill took a few tries to get a reading.
What’s the difference
between O2Ring and O2RingS?
An Improved O2Ring for Overnight Oxygen Tracking
Data Readings
Accurate readings, standard filtering
Storage Interval
4s
Continuous Tracking
Up to 16 hours
Charging Port
Micro USB
Improved signal filtering, more stable and accurate readings
1s
Up to 24 hours
Type-C
Keeps an Eye on Your Oxygen
While You Sleep
In the morning, you’ll see a clear report of your overnight oxygen levels.
The sleep analysis will highlight periods of low oxygen, calculate overnight SpO2 averages, and may even help you notice potential apnea events by correlating oxygen drops with your movement or pulse changes.
Gentle Vibration Alert
Support for Troubled Breathing
Customize Vibration
If your oxygen drops below the level you set, O2Ring-S gently vibrates on your finger to alert you.
You can adjust the vibration strength to match what feels right for you, from subtle to more noticeable.
The alert feels more like a soft nudge than a loud or stressful alarm.
Designed to Stay Accurate
Even When You Move or Turn in Bed
Next-Gen Algorithm
With an upgraded chip and a larger battery, O2Ring-S is able to handle more data more consistently throughout the night.
This allows the ring to stay steady and reliable, even when you change positions during sleep. Small, meaningless fluctuations are filtered out, so you are not disturbed by unnecessary alerts.
When something truly needs your attention, the ring notifies you.
See What’s Happening,
Second by Second.
Stable 1-Second Readings
The upgraded hardware allows O2Ring-S to record your oxygen and pulse every second. By capturing more real data more often, it provides a clearer picture of what happens during your sleep.
You can review a second-by-second report on your phone or computer, and share it if needed. This makes it easy to understand overnight trends and notice brief changes that might otherwise be missed.
This level of detail can help you understand
if your therapy is truly effective
For example,
if your oxygen level stays nice and steady all night,
your CPAP is doing its job.
If you see recurring drops below, say, 91%,
it might be time to adjust your mask or pressure.
For those who want deeper insight,
O2Ring-S uses a high sampling rate to collect detailed sleep data at home.
Some users choose to review this information closely to better understand their own sleep patterns over time.
Upgraded Battery Life
Up to 3 Nights per Charge
Powered by a higher-capacity battery, O2Ring-S runs longer between charges. One full charge can last up to three full nights of overnight monitoring.
That means you only need to charge it about once every 3 days.
Now with a universal USB-C port, power it up from your laptop, power bank, or any common cable for greater flexibility and convenience.
Works Straight Out of the Box
No Constant Bluetooth Required
O2Ring-S works on its own, with built-in memory that stores up to four nights of sleep data.
Just put it on before bed and let it track your sleep overnight. The next day, your data syncs automatically to the free mobile app or to the PC software when you connect.
There’s no complicated setup and no need to stay connected to Bluetooth all night.
Real Stories, Real Impact
Jim Joy
"I didn’t think my wife’s CPAP was working properly. I asked her to wear the Wellue pulse oxygen ring I had bought to spot check my CPAP. A half hour after lights out I woke up with her slapping her hand. I asked what’s wrong? She said this ring thing keeps buzzing. I told her BREATH! It has spiked down to 85% oxygen. I ordered a new auto pressure CPAP (APAP) and used the oxygen sensor ring to dial in the minimum and maximum pressure to keep her above 92%. That included going to a full nose and mouth mask. Data is better than hoping."
Becky Dierks Reuss
"Currently using this & it WORKS! I failed CPAP & BiPAP. Using Alterna oral device and at 5 weeks this oximetry ring…It does not disrupt my sleep. Very user friendly! Got a report after first week of use from company."
Melody Cheeseman Diehl
"I love my ring! Being on oxygen 24/7 after COVID I depend on my ring to wake me when I lose my cannula while sleeping. I also wear at times (like outside gardening) just to check I that I am not overdoing and still at a good level. Best thing I have found"
Carol Jurca
"I just got mine about 5 days ago and it’s a real investment in my health. I didn’t know my oxygen levels were getting so low, down to 80%! I would have never known this unless I was being monitored. For me, it’s money well spent."
Lise MacLeod
"This works really well. It puts a detailed record on your phone that you can study and share. It can be set to ring or vibrate to alert you when your oxygen level is low, so you can take some deep breaths."
Martha Hudson
"I love mine. When O2 drops into the 80%, the ring buzzes me to wake up to breath and 02 goes right back up."
Lyle Shakespear
"The ring stays on and is fairly comfortable. It records data essentially non-stop all night and provides a nice report showing my numbers throughout the night. I'm able to see oxygen levels for the whole night as well as a count of the number of oxygen level drops I had."
Victor Wardle
"Works very well. It does link in with their app easily which can then be exported to other applications.
Fits nicely and not an encumberance."
Tech Specs
Fits Finger Circumference
55 mm – 80 mm (2.17" – 3.15")
Weight
0.6 oz / 17g
Device Dimensions
38mm x 30mm x 38mm (1.5'' x 1.2'' x 1.5'')
Degree of Dust & Water Resistance
IP22
Battery Life
Rechargeable lithium-polymer, 3.7 Vdc; 24 hours for typical use
Charge Time
3 hours
Wireless
Bluetooth 4.0 BLE
Built-In Memory
4 sessions, up to 10 hours for each session
Recorded Parameters
Oxygen level, pulse rate, motion
Oxygen Level Range
70%-100%
Pulse Rate Accuracy
±2bpm or ±2%
Pulse Rate Range
30 to 250 bpm
Oxygen Level Accuracy
±2bpm or ±2%, whichever is greater
Sampling Interval
1 second
Data Display Interval in App
1 seconds
Compatible Computer System
Windows 7/8/10/11;
macOS 10.15.3 or later
Works With
iOS: Version 9.0 or later, iPhone 4s/iPad 3 or later;
Android: Version 5.0 or later, with Bluetooth 4.0 BLE
Frequently Asked Questions
What finger sizes does the O2RingS fit?
The O2RingS fits most adult fingers with a circumference of 55.24 to 80 mm (about 2.17 to 3.15 inches). Its flexible ring design ensures comfort without pressure or numbness, even when worn overnight.
Which finger should I wear the O2RingS on?
For the most accurate readings, wear the O2RingS on your thumb or index finger. These fingers offer a secure fit and stronger blood flow, helping ensure reliable SpO2 and heart rate data. If the fit is too tight or too loose, other fingers may be used as alternatives.
What’s the difference between O2Ring and O2RingS?
O2RingS is the upgraded version with:
→ More stable & accurate readings (200Hz sampling + next-gen algorithm)
→ Longer battery life: 24 hours of continuous tracking
→ USB-C charging: more convenient
→ Higher-resolution data: 1-second interval recordings
Will it fall off during sleep?
The flexible, medical-grade silicone ring is designed to fit snugly and stay securely in place, even during overnight use.
Does O2RingS require a subscription to access O2 scores or other features?
No, O2RingS doesn’t require a subscription. All core features — including real-time oxygen tracking, detailed reports, O2 scores, trend graphs, and data export — are completely free to use.
Does it work without an internet connection?
Yes. The device does not require Wi-Fi or mobile data to function. It stores data locally and syncs via Bluetooth when connected to the app.
Reviews, Q&A
Free Shipping
We offer free shipping for for O2RingS internationally. For countries and regions we can deliver to, the referenced transit time is 2-8 business days.
You can track your order status anytime here https://getwellue.com/pages/track-order. Please feel free to contact us if you have any questions or concerns.
30-Day Money Back Guarantee
At any time within 30 days of receiving your order, you are not 100% satisfied, you may return it to us for a refund.
If you bought the product from www.getwellue.com, you can return it to us. Your payment card will be credited upon receipt of the returned merchandise. Any items damaged due to reasons not covered under warranty cannot be accepted back for refund under our 30 Day Money Back Guarantee.
If you are sure you want to return the goods, please contact us at first at support@getwellue.com. We provide 24/7 ticket and email support. Please contact us if you need assistance.
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