To provide a crime prevention system of a simple constitution wherein an existing alarm unit can be carried in.
The crime prevention system comprises a crescent 2 installed in a window 1 and transmitting a radio signal when an abnormality occurs, a crime prevention alarm unit 3 for generating an alarm sound when the radio signal from the crescent 2 is received and an occurrence of the abnormality is detected and a reporting unit 4 receiving a signal from the burglar-proof alarm unit 3 and transmitting a signal to the outside via the telephone line. The crime prevention alarm unit 3 comprises a box-shaped unit main body 10 receiving the signal from the crescent 2 and generating the alarm sound, a box-shaped radio transmitter 11 transmitting the signal from the unit main body 10 as a radio signal to the reporting unit 4, and a retaining base 12 integrally connecting the unit main body 10 and the radio transmitter 11.
JPH0813862A | 1996-01-16 | |||
JP2004092122A | 2004-03-25 | |||
JP2004232293A | 2004-08-19 | |||
JPH1166467A | 1999-03-09 |