Module performance: Input voltage: 4.35-6 v (recommended voltage 5 v) Load cut-off voltage: 4.2 V + / - 1% Maximum load current output: 1000 mA The voltage of battery overload protection: 4.28 V Battery lifting load: 4.00 V Battery discharge protection voltage: 3.0 V Battery discharge termination voltage: 3.2 V Battery: overcurrent protection current 3 a The size of the board: about 2.5 * 1.65 cm State of the light: no charge, the light is not bright, the red light for recharging, is full of light green.