Specifications Hign-concerned Chemical:None Waterproof Grade:5ATM Model Number:Smart Ring Display screen:No NFC Support:No Activity Tracked:Activity Tracker,Steps Tracker,Distance Tracker,Calorie Tracker Metrics measured:Heart Rate Monitor,Sleep Monitor,Blood Oxygen Monitor,Stress Monitor Item Weight:2.5g Case Material:STEEL Certification:ce,FCC Brand Name:Ola Esporte Battery Capacity(mAh):15mAh Product Parameters: Name:Smart Ring Color:Black,Gold,Silver Size: 8.9.10.11.12 Battery capacity:15mAh Stanby Time:About 15days Working Time:About 5-7days Charing time:0.5H Heart Rate Sensor:Vcare VC30F-S Waterproof Level:5ATM Charging Requirement:Charging 1A or less Major function: 1.Sports modes: (Running, mountaineering, football, walking, badminton, teenagers, basketball, table tennis, yoga,skipping rope, cycling,swimming) 2.Motion data: On the homepage ofthemobile APP, the number of steps, distance,movement duration, and calorie data recorded on the day can be displayed. 3.Heart rate: On the homepage of the mobile app, select the heart rate, click to start at the beginning of the measurement,the indicator light is turned on, and the measurement is completed for 30 to 60 seconds. 4.Sleep: Watches can showthe total sleep last night and the length of light sleep and deep sleep. 5.Blood oxygen: On the home page of the mobile APP, select blood oxygen, click to start measurement,the indicator will light up green,start testing for 30-60 seconds to complete the measurement, and the mobile APP will display the current blood oxygen, blood oxygen and fatigue value. 6.Other: Steps, Distance, Calorie Counting,Heart Rate Measurement, Oxygen Saturation, HRV Heart Rate Variability, Stress, Sleep Tracking, Multi-Sport Mode, Skin Temperature Measurement, Remote Control Photo, Find Ring, Female Physiology Reminder. 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.