3PCS Vibration-Triggered Siren Alarm Hanging Door Window Alarm Door Entry Detector Sensor(Black)
$24.46
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About this item
* Work as an anti-theft alarm alarm siren up to 120dB.
* Perfect travel alarm and great for home hotel dorm etc.
* Just the alarm in door handle/knob when there is someone opens the door or touches the door handle from either side the alarm will generate loud alarm sound to inform there is a intruder.
* The sensitivity may be affected by the composition of the door handle.
* Easy to use and installation no wiring needed (requires 6F22 9V batteries not included); just simply the alarm on the inside of your door handle.
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