GT601_D20S
> App: FitPro
> Bluetooth chip: mcube st17h25
> Heart rate module: Tianyi composite core hrs3300
> Sensor: Rohm kx023
> Display screen: 1.44 inch TFT 128 * 128 pixel
> Battery capacity: 90mAh
> Standby time: about 20 days
> Working time: about 7 days