Shock Personal Alarm JW-LD68 has a strong strobe light and a belt clip on its back. It can be used as a door protector. Features: * With strong ABS housing, belt clip on back. * Pull the pin from the top, the alarm & strobe will activate. * Push button to light the torch & for battery power checking. * Exchange connector with door sensing nipper, this alarm operates as a door protector. Specifications: Alarm Output: 130 dB Battery: " 9V" x 1 Size ( mm) : 72 x 59 x 35 mm Color: Black.