GT601_M4
> App: FitPro
> Bluetooth chip: mcube st17h25
> Heart rate module: Tianyi composite core hrs3300
> Sensor: Rohm kx023
> Display screen: 0.96 inch TFT 80 * 160 pixel
> Battery capacity: 90mah
> Standby time: about 20 days
> Working time: about 7 days