Major function: 1.Steps, Miles, Calories, Motion data recording 2.Multiple exercise modes,Running, cycling, skipping, hiking, mountaineering, yoga, golf, dancing 3.Heart rate monitoring, Blood pressure,blood oxygen monitoring, Sleep monitoring, body fatigue assessment Basic Parameter: Weight: 3.0~4.0g Chipset: AC6323 APP: Smart Health Compatible System: Android 5.1 or Above,IOS8.0 or above BT: V5.0 Bluetooth chips Battery: 20mAh Lithium Polymer Life time: 4-5 days,Stand by time 7-10 days Charging Method: Magnetic Charging Charging time: around 1-2 hours Waterproof Level: IP68 Color: As Shown Material: Stainless Steel size: No. 11 6.4x6.4x2cm Package Contents: 1 x smart ring 1 x charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.