Specifications Hign-concerned Chemical:None Waterproof Grade:5ATM Model Number:Smart Ring Display screen:No NFC Support:No Metrics measured:Heart Rate Monitor,Sleep Monitor,Blood Oxygen Monitor Item Weight:5g Case Material:Alloy Certification:ce,FCC Battery Capacity(mAh):15mAh Feature 1:Holiday Gifts Feature 2:2024 New smart ring Product Parameters: Name:Smart Ring Color: Black,Gold,Silver Size: 7.8.9.10.11.12 Battery capacity:15mAh Stanby Time:About 45days Working Time:About 3-5days Charing time:0.5H G Sensor:STK8321 Heart Rate Sensor:GH3018 Waterproof Level:IP68 Charging Requirement:Charging 1A or less Major function: 1.Sports modes: Running, cycling, Ropeskipping, Walking, Mountaineering, yoga, Dance,golf. 2.Motion data: Accurate distance / accurate calorie data / accurate step count. 3.Heart rate: APP launches heart rate test / Dynamic rate trend and data analysis / Heart rate historical data. 4.Sleep: Precise sleep algorithm, sleep coach reminds. 5.Blood oxygen:APP initiated blood oxygen test / continuous blood oxygen data / historical blood oxygen data. 6.Camera control: The app's shake-to-take-photo feature. 7.Heart rate accuracy: The accuracy rate of static heart rate is more than 98%,(compared with the laboratory test of heart rate belt). 8.Others: Unit format, sedentary reminder, low power reminder, heart rate warning. Notes: 1. After receiving the ring, please use the charging adapter to charge the ring for more than 2 hours. 2. Please scan the QR code of the manual to download the APP before use.