Battery protection(Over charge or Over discharge) Micro USB port Input Type-A USB Output 0.5A current charging 1 switch control USB output 5~8V Input Voltage 3V & 1A Output 5V & 2A Output LED indicate(Green means full,Red means charging) 3V output port x3 5V output port x3 Be careful of "+" and "-", You should follow the direction of "+""-" on the PCB. If you put wrong direction, charging chip will be destroyed. This product does not include 18650 battery