PURPOSE: To prevent an automobile from being driven away, by issueing an alarm when it is detected that the automobile is traveled by a distance of not shorter than a predetermined distance at night.
CONSTITUTION: A microcomputer 1 is connected with a time setter 4 and a pulse generator 5, and is inputted with a set time and a number of revolutions of wheels. The microcomputer 1 operates a buzzer 7 through a buzzer-controlling circuit 6 when the vehicle is traveled by a distance of not shorter than a predetermined distance after the set time. When the vehicle is driven away at night or in other similar occasion, an alarm is issued when the vehicle is traveled by the predetermined distance. Accordingly, the vehicle can be prevented from being driven away.
OKAMOTO YOUICHIROU
NITSUTA KANEO
