Glass Break Alarm CAT Catalogue Description 4: Wireless glass break alarm with a built-in sireneFixes to glass or window paneThis 130 dB alarm goes off when it looses contact with the glassThe sensitivity of the alarm is adjustableAlarm duration: 30 seconds Dimensions L x W x H: 72 x 54 x 22 mm Batteries: 2 x LR03/AAA Colour: White Sound: 130 dB Voltage: 3 VDC