A wireless mouse for inputting commands to a host computer includes a casing, a control circuit, a wireless receiver, an electronic switch circuit and a resilient member. The control circuit includes a wireless module to transmit a wireless signal to the wireless receiver. The wireless receiver can be either received in the port of the casing or attached to a connector of the host computer. The electronic switch circuit includes a control terminal, a power input terminal connected to an external power source, and a power output terminal connected to the control circuit. The input and output power terminals are electrically connected or disconnected according to electrical potential at the control terminal. The resilient member is disposed on an inner side of the port. The resilient member is electrically connected with the control terminal by insertion of the wireless receiver in order to disconnect the input and output power terminals.