Automobile telephone device with battery saver

Abstract From the Canadian patent

An automobile telephone device uses as its power source a battery for the automobile. This applies to an automobile telephone device with an automatic answering or receiving function. In the automobile telephone device a, voltage monitoring unit monitors the voltage of the battery. When the voltage falls near a limit voltage required for starting the automobile engine the, monitoring unit electrically interrupts a power source line connecting the battery and the telephone device via a proper switch circuit to thereby inhibit excessive consumption of the automobile battery by the automatic answering or receiving function during engine stoppage.