| Revew | Amazfit Helio Ring 8 Smart RingThe Amazfit Helio Ring is a smart ring that tracks sleep, heart rate, stress and fitness without needing a watch on your wrist. The size 8 version weighs only 3.65 grams. The ring is made of titanium alloy with a resin inner layer, is rated 10ATM for water resistance and lasts up to 4 days on a charge with typical use. It charges wirelessly and syncs over Bluetooth with the Zepp app on an Android or iOS phone. 
Key features- Comprehensive sleep tracking - Detects deep, light and REM sleep stages, wake-up frequency and naps, and provides a sleep score.
- Advanced sensors - A BioTracker PPG heart rate sensor, temperature sensor, EDA sensor, accelerometer and gyroscope for continuous monitoring through the day.
- Health and fitness metrics - Heart rate, blood oxygen (SpO2), stress level, heart rate variability (HRV), readiness score, PAI and heart rate recovery.
- Up to 4 days per charge - A 16.5mAh battery in size 8, with wireless charging in about 1 hour 40 minutes.
- Light and durable - Weighs 3.65 grams, is 8 mm wide and 2.6 mm thick, and is rated 10ATM water resistant (up to 100 meters).
Specifications| Condition | New | | Brand | Amazfit | | Model | Helio Ring | | Size | 8 | | Material | Titanium alloy outer ring, resin inner ring | | Weight | 3.65 g (size 8) | | Circumference | 60.3 mm (size 8) | | Width and thickness | 8 mm and 2.6 mm | | Sensors | BioTracker PPG heart rate, temperature, EDA, 3-axis accelerometer, 3-axis gyroscope | | Sleep tracking | Deep sleep, light sleep, REM, wake-up frequency and naps | | Health tracking | Heart rate, SpO2, stress, HRV, readiness score, PAI | | Sports modes | 4 | | Battery life | Up to 4 days with typical use | | Battery capacity | 16.5mAh (size 8) | | Charging | Wireless, about 1 hour 40 minutes | | Water resistance | 10ATM (up to 100 meters) | | Connectivity | Bluetooth Low Energy (BLE) | | Compatibility | Zepp app; Android 7.0 and above, iOS 14.0 and above |
In the box- Amazfit Helio Ring (size 8)
- Wireless charger
- Quick start guide
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