| 摘要 |
PURPOSE:To reduce the design cost of a booster and the product cost by utilizing an existing on-vehicle mobile radio telephone set by providing a terminal and a switch part on a portable telephone set. CONSTITUTION:A portable telephone set 40 is provided with terminals 45, 49, 51 and 57 and a switch part 41. In such a state, a sound signal of a microphone 11 and circuit connecting information of a control part 25 are outputted to the outside, and also, a sound signal from the outside is sounded by a loudspeaker 21, and by using a booster device and an existing on-vehicle mobile radio telephone set, and connecting this booster device, the portable telephone set 40 is set to a high output and high sensitivity. In such a way, by utilizing the existing on-vehicle mobile radio telephone set, the design cost of the booster device is reduced, and the product cost can be reduced. |
