Point the transmitter at the window of the room you want to listen in on and the laser can be reflected back to the receiver. The receiver module has a phototransistor to pick up the infrared ...
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Safehome.org on MSNBest Night Vision Security Cameras of 2025Our Top PicksBest Color Night Vision CamerasLorexWith their stout construction, crystal clear video quality, and long-range ...
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