Main Technical Parameters Master Chip: RLC8762 Sensor: BST-BMA253 PPG chip: Everlight Electronics Virbation: Loundspeaker Mute/Vibration Waterproof level: IP67 Compatible System: gam akporo 4.4 na n'elu，iOS 8.2 and above Special Features: Blood Pressure, Heart Rate Screen: TFT 0.96 Color screen 80*160 BLuetooth: 4.0BLE（Low power） Battery Type: Polymeter Lithium Battery Battery Capcaity: 90mAh Charging Type: Clasp type Charging Time: About 2 hours Endurance …