| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a warning system capable of receiving a warning signal saying that a door of an automobile or the like is opened while preventing transmission of a wrong warning signal to the third party. SOLUTION: This warning system is provided with a first portable telephone 1 as a warning signal generating means mounted in the automobile, and a second portable telephone 22 capable of receiving a warning signal transmitted from the first portable telephone 1. The second portable telephone 2 is limited to the telephone carried by an owner of the automobile, whereby while a wrong warning signal transmitted when the owner of the automobile opens the door is prevented from being received by the third party, a warning signal saying that the door of the automobile is opened can be received.</p> |
