US buying guide
Ring and wrist pulse oximeters
For a record of oxygen saturation and pulse rate, compare two designs. The Wellue O2Ring puts the sensor and screen on the finger. The Wellue Checkme O2 Ultra has a wrist display connected to a finger sensor.
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How to choose between a ring and wrist pulse oximeter
| What you need | What to compare |
|---|---|
| A spot check | See the fingertip pulse oximeter guide if you only need to read the numbers at the time of measurement. Compare fingertip pulse oximeters |
| Recording with minimal equipment on your hand | The O2Ring places the sensor, screen, and battery on your finger. |
| Recording with the screen on your wrist | The Checkme O2 Ultra has a wrist display and battery connected to a finger sensor. |
If you need to see a number on the spot, a fingertip clip can cover that task. For a chart showing changes across a session, check what the device stores and where you can review it. The standard O2Ring and the Checkme O2 Ultra do this with two different display locations. The first puts it on the finger and the second on the wrist.
How to choose a ring or wrist pulse oximeter
Fit and battery life
Check the sensor fit and battery life for the variant on the box. Wellue lists up to 24 hours for the O2Ring-S . If you prefer a wrist screen, compare the Checkme O2 Max Style 2, rated for up to 72 hours, and the Checkme O2 Ultra, rated for up to 100 hours. Actual battery life depends on use.
How to review a recording
Decide if you need only a phone view or want to review files on a computer. Check app compatibility and how sessions are saved.
Intended use and limits
Consider symptoms alongside oxygen and pulse readings. Circulation, movement, and skin pigmentation can affect measurements. If a clinician asked you to monitor, ask which device to use and how to interpret the readings.
Check the fit in the position you expect to use the device. For a ring, see how it stays in place and whether you can read the display. With a wrist unit, check the strap and how the cable rests. If keeping a record is your priority, find out what format the app provides for review or sharing.
Two ring and wrist pulse oximeters compared
| Feature |  Wellue O2Ring Standard, blackView on Amazon.comAffiliate link | Wellue Checkme O2 Ultra, black View on Amazon.comAffiliate link |
|---|---|---|
| Placement | Ring with a screen on the finger | Finger sensor cabled to a wrist unit |
| Readings | SpO₂ and pulse rate | SpO₂ and pulse rate |
| On-device reminders | Adjustable vibration | Adjustable vibration or sound |
| Recording interval | App chart shows data in 4-second intervals | Saves one reading per second |
| On-device memory | Last 4 sessions, up to 10 hr each | 4 sessions, up to 12 hr each |
| Battery life and charging | Up to 16 hr, Micro-USB charging | Up to 100 hr, magnetic charging |
| Review recordings | ViHealth and O2 Insight Pro | ViHealth and O2 Insight Pro |
| Export | PDF report from ViHealth | PDF or CSV reports from the app or computer software |
Listings reviewed November 11, 2026. Check delivery for your ZIP code. Features come from the product documentation and manuals.
Separate three figures when reading the table. Battery life tells you how long a charge can last. The session limit tells you how much fits in one recording. The interval tells you how often a value is saved. If you need to review several sessions, also check how many the device holds before you transfer them.
What reminders each pulse oximeter provides
On-device reminders
The O2Ring vibrates. The Checkme O2 Ultra lets you choose vibration or sound. Use the instructions for the exact model to set up reminders.
Reminders and history on your phone
Both models can save recordings in their own memory. Sync after a session to review the chart. Reviewing reports and receiving reminders are separate features.
Before relying on a reminder, distinguish what the device can show while you wear it from what you see in the report afterward. Both models can keep recording with the phone disconnected. Sync at the end to review or share the chart. Check each manual for which reminders can be configured on the device and which appear in the app.
Wellue O2Ring Standard: sensor and display on your finger
Wellue O2Ring Standard Black
Records a data point every four seconds. The standard model charges by Micro-USB, and Wellue lists up to 16 hours per charge.
The standard model makes sense if you want to leave your wrist free and the ring fits your finger. Wellue documents storage for the four most recent sessions of up to ten hours each. If you want to keep several nights of data, sync regularly and check that the dates are correct.
Wellue Checkme O2 Ultra: wrist display and finger sensor
Wellue Checkme O2 Ultra Black
Saves up to four sessions of 12 hours each, with a data point every second. The sensor connects to a wrist unit with the screen and battery.
The display and battery sit on the wrist. The finger probe detaches, and the magnetic charging connection is separate. You can review the record in ViHealth or O2 Insight Pro. If you plan to share it, check the manufacturer’s PDF and CSV export options.
Wellue O2Ring vs. O2Ring-S
The O2Ring Standard records a sample every four seconds and charges by Micro-USB. Wellue lists up to 16 hours per charge. The O2Ring-S records every second, uses USB-C, and Wellue lists up to 24 hours. Both figures are manufacturer estimates. Check the separate US listings below for the version you want.
Other ring and wrist options available in the United States
See two more Wellue models
Wellue Checkme O2 Max, Style 2
Wrist unit with a cable to a finger sensor. The screen and battery sit on the wrist.
Wellue lists up to 72 hours per charge. Review records in the app or desktop software.
View on Amazon.comAffiliate link
Wellue O2Ring-S Standard, black
Self-contained ring with a vibration reminder.
Up to 24 hours according to Wellue. Bluetooth recording.
View on Amazon.comAffiliate linkTo distinguish these two additional options, start with the form factor and charger. The O2Ring-S Standard has its sensor and display on the finger and charges over USB-C. The Checkme O2 Max Style 2 has a wrist unit and a wired probe. To match the photo, check the Style 2 listing for the black strap and stud fastener.
Overnight recordings and their limits
Check the fit of the sensor and strap separately. With a wrist unit, keep the cable from pulling on the finger sensor.
Battery life tells you when to recharge. Session length and storage tell you how much data the monitor keeps.
Battery runtime and storage capacity measure different things. Download sessions if you want to keep more history than the device can store. Check that the sensor stays in position during the session.
An overnight recording brings together oxygen and pulse readings for later review. Talk with a healthcare professional about symptoms or suspected sleep apnea.
Questions before you buy
Does longer battery life mean a longer usable recording?
The listed battery life depends on the model and how you use it. Check the sensor fit and how to export recordings.
Is a vibration reminder a clinical alarm?
Check the intended use and limits in the manual. A consumer reminder alone does not establish that it can function as a clinical alarm.
To make a session easier to review, note the approximate time and any change in sensor placement you remember. If the chart has gaps, check the manual and sensor fit before interpreting those periods. If you need a record for a medical decision, ask your health professional what data and type of device they need.
Sources and other guides
- Wellue O2Ring and its variants
- Wellue Checkme O2 Max
- FDA: pulse oximeter basics
- Wellue product page · Wellue O2Ring-S Black, Standard
- Wellue product page · Wellue Checkme O2 Ultra Black