There is a certain amount of self-consumption power when the AC port is turned on. In order to improve the battery life span of P2001, when P2001 detects that the output power of the AC port is less than 2W, it will automatically turn off the output port within 3 hours. The output power is less than 3W, and the port output is automatically turned off within 6 hours. When the output power is more than 3W, P2001 continues to work. It is not recommended to use the AC port for power supply for low-power or energy-saving products. It can be powered directly using the DC or USB port.