This Knocking Sensor,when paired with the Vertical Peephole Viewer with Micro SD Slot,will record an image when a visitor knocks on your door. Even when you're not home,you will know who came knocking on your door!
When the sensor detects the vibration from your door,it will wake up the Peephole Viewer to record images. It just snaps securely into the back of the Peephole Viewer,safely mounted inside your home.
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