Feature:1. Fitness Data Recording: Achieve your fitness goals with the smart ring's fitness tracking capabilities. It can accurately record your distance, calories burned, and exercise time, keeping you informed about your daily progress.2. Sleep Monitoring: Evaluate sleep quality based on REM sleep, light sleep, and deep sleep ratios throughout the sleep cycle, providing appropriate advice to improve your sleep health.3. IP68 Waterproof Technology: Fully sealed structure with IP68 waterproof technology, suitable for swimming, hand washing, showering, etc., meeting various waterproof needs.4. Long Battery Life: Equipped with low power control chip and 20mAh polymer lithium battery, offering extended battery performance with deep power management and low power mode selection.5. Multi Sport Tracking: Support various sports activities and map tracking, including walking, running, cycling, etc., view exercise data on the app, such as exercise time, distance, calories burned, and more.Specification:Item Type: Smart RingMaterial: MetalBattery Type: Lithium Ion BatteryBattery Capacity: 20mAh (Shipped with built in battery)Battery Life: 3-5 days, depending on usage frequencyBluetooth Version: BLE5.1Bluetooth Range: 3-5 metersWaterproof Level: IP68Compatible System: For IOS, for AndroidCharging Method: Magnetic ChargingWearing Instructions: Measure the circumference of the wearing finger with a tape measure.Package List:1 x Smart Ring1 x USB Cable1 x User Manual