Sleep Analysis: Comprehensive understanding of sleep behavior, time, stage and more. The sleep tracking feature makes it an ideal health companion Health Monitoring & Fitness Tracking: It can monitor your heart rate, blood oxygen saturation 24 hours a day, making sure you know your health at all times. And it can accurately record your steps, distance and calories consumed Camera Remote Control: Use as a remote shutter, allowing you to take selfies or group photos without help. You can easily record the perfect shot even when you are alone 5ATM Waterproof: Reaches the 5ATM diving grade waterproof standard. Whether it is daily washing hands, taking a shower, swimming, or even doing water activities such as snorkeling, it can provide reliable waterproof protection Wide Compatibility: It supports for Android 5.0 and above, for iOS 10 or above Specifications: Size: #7 inner diameter: 17.4mm #8 inner diameter:18.2mm #9 inner diameter: 19.0mm #10 inner diameter: 19.9mm #11 inner diameter: 20.7mm #12 inner diameter: 21.5mm Weight:2.8g Battery capacity:About 18mAh Working time:10 days Charging time:About 2 hours Main control chip:Dialog DA14531 Gravity sensor:SC7A20 Heart rate sensor:3602 Blood oxygen sensor:3602 Bluetooth:5.2 Bluetooth distance:10m Charging method:Magnetic charging Functions:Calorie counting, Step counting, Movement recording, Automatic measurements, Heart rate monitoring, Blood oxygen monitoring, Sleep monitoring, Exercise heart rate, Health reminders, Take photos remotely Compatible systems:iOS 10 and above, Android 5 and above OTA upgrades:Support Package included: 1 x Smart Ring 1 x Charging Cable 1 x English User Manual Other things not included