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 Item Weight:5g Case Material:Alloy Certification:ce,FCC Brand Name:Ola Esporte smart ring:health monitoring multi-sport:for 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. Parameter: Chipset: AC6323 Compatible System: Android 5.1 or above, iOS 8.0 or above RAM Memory (built-in in the main control): 4Mb BT: 5.0 Bluetooth chip Acceleration Sensor: SC7A20H Heart Rate: Peak GH3018 Battery Type: Polymer Lithium ion Capacity: 15mAh Charging Method: Magnetic charging Waterproof Level: IP68 Charging time: approximately 1-2 hours Appearance material: epoxy resin+stainless steel Function: Steps, kilometers, calories, exercise data recording Heart rate measurement, sleep health monitoring, intelligent photography, adding friends Multiple sports modes, including running, cycling, skipping rope, brisk walking, hiking, yoga, golf, and dance