Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
uaue TM21 Size 8 Smart Ring
Available offers (3)
Current
—
Size 8
Retailer
€22.28
Available to order
Price history by offer
Volatility: HighFeatures
- Heart rate monitoring
- Sleep tracking
- Activity and step counting
- Women's health cycle tracking
- Touch control for phone functions
- Vibration alerts for notifications
- IP68 waterproof rating
- Long battery life up to 6 days
- No subscription required
- Compatible with iPhone and Android
General specs
- Brand: uaue
- Model: TM21
- Seller: Retailer
- ID: B0FJ26XB4S
- Size: 8
- Material: Metal
- Battery Life: 4~6 d, 25 d standby
- Connectivity: Bluetooth
- Display Type: None
- Charging Time: 0, 1
- Charging Method: Magnetic
- OS Compatibility: Android, iOS
- Water Resistance: IP68
- First listed by seller: January 21, 2026
If you are interested in more details, you can find full information on the seller's page.
Price History for seller Retailer
Shipping options
Delivery to 
United States
United States
Available
For the busy professional or fitness enthusiast who wants health insights without a bulky device, this smart ring offers a discreet way to track your wellness. Think of it as your personal health assistant, perfect for monitoring daily activity during work hours or sleep patterns overnight.
Unlike basic fitness trackers, this ring focuses on holistic health. The high-precision chip continuously monitors metrics like heart rate, sleep stages, and body temperature. You will notice the vibration alert for incoming calls or health reminders before your phone even buzzes. It automatically tracks deep and light sleep, so you can adjust habits based on weekly reports in the free app.
With IP68 waterproofing, it withstands sweat and rain during workouts. The touch control lets you switch music or take photos remotely. For women, it supports menstrual cycle tracking with custom reminders. No subscription is required, and the battery lasts up to 6 days with 24/7 wear.
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| Brand | uaue | FKGZJF | SARUNN ER | Weylmd | KppeX | Mexlyca |
| Model | TM21 | X1-11# | SF20250921B0FGY2QWT4 | |||
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| Price | €22.28 | €88.27 | €14.12 | €47.24 | €124.81 | €14.26 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Jun 24, 2026 | Apr 23, 2026 | Mar 21, 2026 | Mar 21, 2026 | Mar 21, 2026 | Apr 15, 2026 |
| Size | 8 | 8 | 7 | 9 | 11 | 9 |
| Material | Metal | Metal | Titanium Alloy | Stainless Steel | Metal | |
| Battery Life | 4~6 d, 25 d standby | 3–5 d | 5–7 d | 3–5 d | 3–5 d | |
| Connectivity | Bluetooth | Bluetooth | Bluetooth | Bluetooth | Bluetooth | Bluetooth |
| Display Type | None | OLED | None | |||
| Charging Time | 0, 1 | 2 | 2 | |||
| Charging Method | Magnetic | Magnetic | Magnetic | Magnetic | Magnetic | |
| OS Compatibility | Android, iOS | Android 4.4, iOS 8.4 | Android, iOS | Android, iOS | Android 4.4+, iOS 8.4+ | Android, iOS |
| Water Resistance | IP68 | IP68 | IP68 | IP68 | IP68 | IP68 |
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