Abstract: A remote control transmitter is so constructed that when a group menu representing a combination of individual functions is selected by operation of an operating part, a controller effects display of the individual functions of the group menu in parallel with the group menu. Since the correspondence between an overview of the plurality of group menus and the individual functions of the specified group menu is easy to understand, the remote control transmitter obtained allows easy setting of the function.

Abstract: A communication device includes an oscillator oscillated with a predetermined frequency and an oscillation circuit for exciting and oscillating the oscillator. The communication device also includes a receiving circuit for receiving a signal from outside that is superposed with a carrier wave. A receiving circuit outputs a signal from which the carrier wave is removed. The communication device also includes a reception section power source switching circuit for switching whether or not power is supplied to the receiving circuit and the microcomputer as a control means for controlling the switching. The microcomputer is connected to the oscillation circuit and starts, immediately after detecting the oscillation of oscillation circuit, the detection of an output signal of the receiving circuit.

Abstract: A remote control transmitter is so constructed that when a group menu representing a combination of individual functions is selected by operation of an operating part, a controller effects display of the individual functions of the group menu in parallel with the group menu. Since the correspondence between an overview of the plurality of group menus and the individual functions of the specified group menu is easy to understand, the remote control transmitter obtained allows easy setting of the function.

Abstract: A key input device includes first and second key input electrodes being close to each other and being accessible by a finger of an operator. First and second signal input electrodes oppose the first and second key input electrodes respectively. A first signal is applied to the first signal input electrode. A second signal is applied to the second signal input electrode. The first signal and the second signal have different phases.