Abstract: A blue tooth mouse assembly includes an interface module having a USB coupler for coupling to computer facility and an interface switching device coupled to the USB coupler. A mouse module includes an interface device coupled to the interface module, an electric power supply circuit coupled to the interface device to receive electric power from the computer facility, and a detecting device to detect coordinate signals and movement signals of the blue tooth mouse assembly to the computer facility. A blue tooth module is coupled to the interface module, and includes a signal transforming device and an antenna to receive and send signals.