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:10 Case Material:Alloy Certification:ce,FCC Brand Name:Ola Esporte Battery Capacity(mAh):16mah Function: Dynamic heart rate measurement, heart rate variability measurement,Measurement of blood oxygen saturation,Pedometer/Calorie consumption,Exercise mode (running/Brisk walking/cycling),Multi-dimensional sleep monitoring (Built-in sleep-aid music in the APP),Body surface temperature detection to determine the trend of body temperature changes,Psychological state, stress measurement,Remote control of mobile phone for taking photos,Care from relatives and friends,Motion-sensing game Parameter: Color: Rose Gold,Silver Size: 6#-7#-8#-9#-10#-11#-12# Chipset: AB2026B3 Compatible System: Android 8.0 and higher versions; IOS12.0 and higher BT: 5.4 Bluetooth chip Acceleration Sensor: DA267 Heart rate sensor: HX3918+Three-color LED lights Temperature sensor:NTC(0.5) Capacity: 15mAh Charging Method: Magnetic charging/Box Waterproof Level: IP68 Charging time: approximately 1-2 hours Appearance material: epoxy resin+stainless steel Note: 1. For best performance and accuracy, we recommend wearing the Ring on your index finger. If you prefer other fingers, the middle and ring fingers are also OK. Avoid fingers where the base is narrower than the knuckle. 2. The size of rings may not be completely in line with universal standards. Please measure your finger circumference before purchasing and make sure it fits comfortably, then choose the appropriate size. 3. How to start: Charge the Ring with the included charging cable. The heart rate light will light up to indicate successful startup. Then you can use the APP to connect the Ring. 4. Due to different display and lighting effects, the actual color of the item may be slightly different from the color shown on the picture. Please allow 1-2cm measuring deviation due to manual measurement, thank you! 5.It is Life waterproof only, it mean you can wear it when you wash your hand or get wet in the rain, but can't wear when swimming or hot shower/bath or sauna. It can not be soaked in water.