Chip: Ruiyu RTL8762DK The Android system supports Android 4.4 and above versions IOS system Apple iOS 10.0 or above Heart rate sensor: Tianyi Hexin HX3605 Bluetooth dual Bluetooth: 5.0 Waterproof level: IP67 Product process: Zinc alloy+IML Net weight of the body: 35 grams Screen size: 1.9 inch square screen Screen resolution: 240 * 283 Screen type: IPS full angle color screen Screen material: glass Total length of wrist strap: 248mm Wrist strap material: silicone Battery type: Lithium battery Battery model: 521726 polymer Battery voltage: 3.7V Battery capacity: 260mAh Battery life: 5-7 days of normal connection and 15-25 days of standby. (Connection usage depends on personal usage) Charging method: wireless charging Charging time: about 3 hours