You can purchase small RF (radio frequency) detectors that beep when they are near a device transmitting data.
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A small piece of aluminum (from a soda can) and a sewing pin. The "Film": Photographic paper (like Ilford Enlarging Paper You can purchase small RF (radio frequency) detectors
: Check common items like smoke detectors, alarm clocks, and USB chargers for unusual lenses or lights. Flashlight Trick beach cabin hidden cam best