To solve a problem wherein a crime-preventive buzzer in the prior art is used mischievously because an alarm sound can be sounded repeatedly any number of times, a problem wherein the reliability of the alarm gets low in the third party even when the alarm sound is sounded at the time of necessity, and a problem wherein the third party receiving an announcement can not be specified.

The alarm sound is prevented from being sounded mischievously, by making the crime-preventive buzzer disposable at once use. The reliability gets remarkably high in the third party, since the alarm sound is sounded only when requiring an assistance or help. A position and a situation are notified to the predetermined specified third party receiving the announcement, by a GPS 6 and a video camera 7 built in the crime-preventive buzzer, and an advice for proper dealing is received from a voice reception speaker 9, to solve quickly and exactly a case and an accident.