Abstract: A cellular phone base capable of switching cellular phone and cordless phone communications is disclosed. The cellular phone base comprises a telephone interface connected to a telephone line; a cellular phone interface connected to a cellular phone; a control unit installed in the cellular phone base; a transmission/reception unit connected to the control unit, the transmission/reception unit being under control of the control unit and communicating with a corresponding wireless earphone; and at least one switch connected to the telephone interface, the cellular phone interface, the control unit, and the transmission/reception unit, wherein the switch normally connects the transmission/reception unit with the cellular phone interface, and when the telephone interface is connected to the control unit, a signal is sent to the control unit to switch the switch such that the transmission/reception unit is connected to the telephone interface.

Abstract: The present invention relates to a wireless display device and display method thereof capable of optionally receiving at least two sources of display signals, wherein the first display signal is provided by a host computer of a wireless computer system via wireless communication, and the second display signal is provided by a portable electronic device via cable communication, whereby the display device used indoors is upgraded as a portable outdoor display. The present invention further provides a switch for cutting off power form batteries to the wireless communication circuit as display signals form the portable electronic device are received, so as to reduce power consumption by the display device and thus prolong the display time thereof.

Abstract: A pen base mouse is constructed to include a penholder holding a circuit board, the circuit board having a wireless transmitter for signal output to a computer, a cursor control unit mounted in one end of the penholder and adapted to control a pointer on a computer screen, and three button units including a left button unit, an intermediate button unit, and a right button unit, each button unit having a roller peripherally extended out of the penholder for rotating and pressing by the user to produce a respective control signal to the circuit board.