Model N8 Ultra Dimension 45*38*13mm Weight 50g Shape Rectangular Display TFT Screen Size 2.02 Inch Screen Resolution 395 x 460 pixels Compatible Os Android & IOS Sensors Spo2 sensor, Heart rate sensor Bluetooth V5.0 Color Silver, Black, Orange Belt Replaceable Yes Belt Size 49mm Multi-sports mode Yes Heart rate monitor Yes Blood Oxygen Monitor Yes Blood Pressure Monitor Yes Waterproof IP68 Waterproof Additional Features Sedentary reminder, Sleep monitor, Alarm, Barometer, Brightness Adjusting ….etc Battery Capacity 380 mAh Charging mode USB cable Normal usage 3-4 days Strap Nylon