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Detector "of eavesdropping devices (radio microphones, radiotransmitters, etc.). Allows you to find the "bugs" that operates at frequencies from a few tens kilohertz to 500 megahertz. Antenna - a piece of wire, a length of ~40 cm.
The headphone output from the player (low impedance). Power from battery "Krona".
Publication: www.cxem.net