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Seeker covert wiring "B3-1RM2I" presumably produced since 1985. The device is designed to search for hidden wiring electrical or radio broadcasting network when repairing an apartment or house. When approaching the electrical wiring without a load, you could hear a background of 50 Hz at a distance of up to 10 centimeters, with a load of up to 30 ... 50 centimeters. When approaching the radio broadcasting wires without load, the first radio program was heard at a distance of up to 10 centimeters, with a load in an outlet of 1 kΩ, up to 50 centimeters. The sensitivity of the device is regulated, powered by a battery type D-006.