Brand : Amazfit Model : Amazfit Bip U | Amazfit Bip U Pro Dimension : 40.9 x 35.5 x 11.4mm Weight : about 31g Wristband Length : 118 mm Wristband Width : 20 mm Body Material : Polycarbonate Strap Material : Silicon Rubber Screen : 1.43" Full Color TFT, Resolution 320 x302 5ATM Water Resistant Connectivity : Bluetooth 5.0 BLE Battery Capacity : 230mAh lithium-ion polymer battery Battery Life : 9 days (normal use) Microphone : Yes (Amazfit Bip U Pro only) Positioning : GPS (Amazfit Bip U Pro only) Supported Devices : Android 5.0 or iOS 10.0 and above APP : Zepp