Myasoedov recommends placing Bluetooth speakers or a working radio near any suspicious areas behind an opaque surface, and if there is interference in the sound, this could indicate a possible wiretapping.
He suggests turning off the lights in the room and putting a flashlight in every corner to detect hidden cameras. If the light is broken somewhere, most likely there is recording equipment. If the device has a night vision function, it usually has an infrared light built into it, which can be seen in complete darkness or through the camera on your gadget.
Source: Ferra

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