| This is a dual purpose 120db alarm. It acts
as a burglar alarm and a personal alarm. Hang it on any door knob
(non-metallic doors) and it instantly and automatically sounds when an
intruder touches the door knob. It works by sensing the vibrations
a hand makes when it makes contact with a door knob. Carry it with you and just pull out the
metal chain to sound the alarm and deter an assailant. The alarm
will sound until either the metal chain is returned into the device or
the battery runs out; whichever comes first. Uses one 9-volt
battery. |