Knob Sentry
http://www.knob-sentry.com Knob-Sentry -- is a passive alarm device that attaches to door knobs in seconds... Simply lock you door, attach the device over your interior door knob, and turn the power "ON". The device operates on a 9 volt battery which does not drain until the siren (108db) is activated. Siren activation occurs when the knob is turned in a few degrees left or right and will remain on until the power is turned "OFF". This device offers the user the peace of mind that the alarm will sound even before the door has been opened by the intruder, giving you immediate deterrence. For those looking for an inexpensive home alarm solution in deterring home invasion, the Knob Sentry is a key home security device. *Knob Sentry device qualifies for a discount on most homeowner and renter insurance policies.From:vmercialViews:2 0ratingsTime:08:37More inScience Technology
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Knob Sentry - Video
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