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Portable Door
Security Alarm System
Door Knob Alarm provides you with
protection while at home or on the road. Hang this alarm
over the doorknob, and it alerts you with an
ear-splitting 120dB alarm when the doorknob is touched.
Works on all non-metal doors containing a metal
doorknob. May also be used as a personal alarm by simply
pulling out the pin attached to the metal chain. Uses
one 9-volt battery (sold separately).
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