| 摘要 |
PURPOSE:To operate an auxiliary callout device effectively, even if an engine key is taken off at seat leaving, in a system having the auxiliary callout device (energizing alarm of a car or illuminating lights) which informs incoming call to a telephone user, when leaving seat. CONSTITUTION:In figure, 1 is a radio telephone set, 5 is an auxiliary callout device and 3 is a power supply switch. The switch 3 is controlled with a power supply controlling line 2 interlocked with an engine key and it is opened when the engine key is taken off. A switch 7a which enables the operation of the device 5 and a switch 7b connected in parallel with the switch 3 are provided and the switch 7b is interlocked with the switch 7a. When the switch 7a turns on at leaving seat, since the switch 7b interlocked with it turns on, even if the engine key is taken off and the switch 3 turns off, the radio telephone device 1 and the auxiliary callout device are made operable. |
