Model: M3 G-SENSOR:RT3000B Battery: 110mAh ( Stand By 8-10 Days ) Power interface: USB interface Vibration motor: 0827 wire welding motor Bluetooth: Bluetooth 4.0 Compatible system: Android /IOS Net Weight: 18.4g Gross weight: 37g Product size: 255mm*18mm*12mm/10.03*0.7*0.47” CPU: Telink 8266 Display: 0.96″ TFT Key: single touch APP Name: Flagfit 2.0 Heart rate monitor. Touch key and press key operated. Gesture control, turn the wrist lit screen. Calculate heart rate accurately by PPG sensor. Keep connected with a smartphone through Bluetooth.