Product information: Flash memory size: 128MB Andiord system: support Android 4.4 and above IOS system: Apple IOS10.0 or above Heart rate sensor: Zhanheng BD1662_I2C Bluetooth: Bluetooth 4.0+Bluetooth Audio 5.0 Waterproof level: IP67 Product process: zinc alloy +IML Net weight: 40 grams Screen size: 1.32 inch full circle Screen resolution: 360*360 Screen type: IPS full viewing angle color screen Screen material: TFT Total length of wrist strap: 260 mm Wristband material: belt, steel belt Battery type: Lithium battery Battery model: 551830 Battery voltage: 3.7V Battery capacity: 280mAh Life time: 4-5 days for normal connection and 10-15 days for standby. (Connect to use depends on personal usage) Charging method: wireless charging Charging time: about 3 hours Wristband color: steel belt and silver, brown belt Packing list: Packing box, data cable, manual *1