A connector includes a cavity, a detecting portion, and a door. The cavity includes a first interface, the detecting portion is set in the cavity, and the door is set at the first interface. A first door first end includes a metal portion, such that when an external device enters in the cavity through the first interface by pushing the door, the metal portion is coupled to the detecting portion, and the detecting portion outputs a first control signal accordingly. When an external device is inserted into the connector, a power is supplied to the connector, when the external device is not inserted into the connector, the power is not supplied to the connector, thus achieving the purpose of energy conservation.