Someone knocking at the door? You’ll know right away with the Knock Sensor. It easily attaches with velcro to the inside of your door to let you know when you have visitors! Since it is sensitive to vibrations only, it will not pick up other outside noise. When activated, a bright, flashing light alerts you.

• Easy installation
• Optional bracket to hang on door
• Automatic shut-off after five seconds until activated again
• 9V battery (not included)

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