A charger includes a body and a pin. The body includes a main body, a first cover body, and a second cover body. The pin is fixedly disposed on the main body. The first cover body and the second cover body are each connected to an rotatable relative to the main body to have a first state and a second state. In the first state, the first cover body and the second cover body are attached to each other, and at least part of a structure of the pin is accommodated in the first cover body and second cover body. In the second state, the first cover body and the second cover body depart from each other to enable the first cover body and the second cover body to expose the at least part of the structure of the pin to the outside.