Ring vs Tracker
Compare screen-free rings with wrist fitness trackers for sleep comfort, workout feedback, sizing, battery life, and when a smartwatch is the fallback.
R12 Smart Ring: Blood oxygen sensor
This smart ring is your quiet health companion for tracking sleep, heart rate, and blood oxygen throughout the day. It's designed for someone who wants continuous health data without wearing a bulky wrist device. I wear mine while working out and sleeping, and the slim profile never gets in the way.
The blood oxygen sensor alerts you when your SpO2 dips during sleep, which helped me realize I needed better breathing habits. Heart rate tracking updates in real time, so you see your recovery rate after a run. The sleep tracking detected my restless nights after late workouts, giving me motivation to adjust my schedule.
Water resistance means you can wear it while washing hands or in light rain. The ring syncs seamlessly with Android and iOS via Bluetooth, and the app shows your daily trends. It's a practical tool for taking control of your health without extra hassle.
Features
- Heart rate monitor
- Sleep tracking
- Water resistant
- Blood oxygen sensor
General specs
- Model: R12
- Seller: AliExpress
- ID: 1005012336619630
- Type: Smart Ring
- Model: R12
- Compatibility: Android
- Sleep Tracking: Yes
- Water Resistance: Yes
- Heart Rate Monitor: Yes
- Blood Oxygen Sensor: Yes
- First listed by seller: June 18, 2026
If you are interested in more details, you can find full information on the seller's page.
€15.66
Last price update: 7/26/26
Available to order
Price History for seller AliExpress
Shipping options
Delivery to 
United States
United States
Available
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| Brand | A46U | ZBNMY | ||||
| Model | R12 | R09 | A46U SY15 | |||
| Color |
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| Rating |
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| Price | €15.66 | €20.82 | €16.80 | €30.31 | €11.31 | €18.75 |
| Seller | AliExpress | AliExpress | AliExpress | Retailer | AliExpress | AliExpress |
| Update | Aug 1, 2026 | Aug 1, 2026 | Jul 31, 2026 | Mar 21, 2026 | Jul 31, 2026 | Jul 31, 2026 |
| Type | Smart Ring | Smart Ring | Smart Ring | |||
| Compatibility | Android | Android, iOS | iOS, Android | |||
| Heart Rate Monitor | Yes | Yes | Yes | Yes | ||
Smart Ring Blood oxygen sensor
€15.66
When this device makes sense
Product confidence
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