Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
FKGZJF Silver, Size outer circumference Smart Ring with Health Tracking
Available offers (3)
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Current
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Silver, Size outer circumference
Retailer
€30.39
Available to order
Price history by offer
Volatility: HighFeatures
- 24-hour heart rate monitoring
- Blood oxygen tracking
- HRV monitoring
- Sleep tracker with deep and light sleep
- Step and activity tracking
- Multiple sport modes
- No subscription fees
- Up to 60 days battery with charging case
- IP68 waterproof
- Compatible with iPhone and Android
General specs
- Brand: FKGZJF
- Seller: Retailer
- ID: B0GDNF3LZT
- HRV Monitor: 24-hour HRV
- Sport Modes: running, cycling, skipping rope, walking, hiking, yoga, dancing, golf
- Battery Life: 3-5 days, 60 days with charging case
- Step Tracker: yes
- Charging Time: 2 hours
- Compatibility: Android 4.4+, iOS 8.4+
- Sleep Tracker: yes, deep sleep, light sleep
- Stress Tracker: yes
- Size Measurement: outer circumference
- Subscription Fee: None
- Activity Tracking: steps, calories, distance
- Waterproof Rating: IP68
- Heart Rate Monitor: 24-hour heart rate
- Blood Oxygen Monitor: 24-hour blood oxygen
- Charging Case Battery: 400 mAh
- First listed by seller: May 20, 2026
If you are interested in more details, you can find full information on the seller's page.
Price History for seller Retailer
| Date | Price |
|---|---|
| 5/20/26 | €48.14 |
| 5/20/26 | €53.49 |
Shipping options
Delivery to 
United States
United States
Available
Are you a sleep tracker who hates wearing a bulky gadget to bed? This FKGZJF smart ring offers a more comfortable way to track your health. It fits around your finger and is so light you'll forget it's there. Measure your finger before ordering. Pick a slightly snug size to prevent it from slipping off.
Get insights on your sleep quality, heart rate, blood oxygen, and stress levels without a subscription fee. The ring tracks your sleep automatically and shows deep and light sleep on the app. You can also see your daily steps, calories, and route during activities like running, cycling, or yoga. The battery lasts up to 5 days, but the included charging case gives you up to 60 days of use. Charge the case with the USB-C cable, then pop the ring in for a quick top-up.
The smart ring works with your phone (iOS 8.4 or Android 4.4+). It's waterproof (IP68) and comes in silver. It's a practical tool for anyone wanting a clear picture of their health, from sleep to workouts. No monthly fees. No extra accessories needed.
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| Brand | FKGZJF | Sqrutri | SECRETTOP | LIBAXIN | BENIO | TYUIOL |
| Model | R26 | Smart Ring | Gen4 | |||
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| Price | €30.39 | €79.37 | €178.36 | €17.83 | €41.02 | €21.39 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | May 29, 2026 | May 20, 2026 | May 27, 2026 | May 29, 2026 | Apr 27, 2026 | May 29, 2026 |
| Battery Life | 3-5 days, 60 days with charging case | N/A | Not specified | |||
| Waterproof Rating | IP68 | IP68 | IP68, 5ATM | |||
| Size | 9 | 8# | 9 | 9 | ||
| Weight | N/A | Ultra-thin and lightweight (no specific value given) | Not specified | Lightweight | 0.01 lbs | |
| Sensors | Heart Rate, Blood Oxygen, Blood Pressure, HRV | Heart rate, Blood oxygen, Step counter, Calorie tracking, Sleep monitoring | Heart Rate Monitor, Blood Oxygen Sensor, Blood Pressure Sensor | 4.0 sensors | ||
| Water Resistance | IP68 | Yes | IP68 | |||
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