Specifications Hign-concerned Chemical:None Waterproof Grade:3ATM Model Number:Smart Ring Display screen:Yes NFC Support:No Activity Tracked:Activity Tracker,Steps Tracker,Distance Tracker,Calorie Tracker Metrics measured:Heart Rate Monitor,Sleep Monitor,Blood Oxygen Monitor Item Weight:2.5g Case Material:STEEL Certification:ce,FCC Brand Name:Ola Esporte Battery Capacity(mAh):16mAh Product Parameters: Name: Smart Ring Color: Black Size: 8.9.10.11.12 Battery capacity:20mAh Stanby Time:About 16-20days Working Time:About 3-4days Charing time:0.5H G Sensor:SC7A20 Heart Rate Sensor:Tianyi 3918 Waterproof Level:IP68 Charging Requirement:Charging 1A or less Compatible SystemAndroid 5.1 or AboveIOS8.0 or above Major function: 1.Sports modes: Running, cycling, skipping, hiking, mountaineering, yoga, golf, dancing. 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: Steps, distance, calorie counting ,Heart rate, Blood pressureBlood Oxygen, sleep Monitoring, Care for faimilies(add friends), Remote camera,Hand gestures brush tiktok, Wave your hand to take a picture immediately. 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.