The Door Beacon - Door Knock Sensor
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<div style="text-align:left"><b>[Product Information]</b></br><ul><li class="showHiddenFeatureBullets"><span class="a-list-item">
                    Knocking on the door shakes the sensor causing it to flash
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                    Adjustable sensitivity switch reduces false alerts/saves battery
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                    Three different mounting options included
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                    Includes one-year warranty and simple instructions
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                    Great for home, travel and noisy environments
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