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The radio detector detector '' LDV-2 '' (Amateur Detection Broadcasting 2 version) since 1924 produced an electrical engineering trust of low-current factories. "LDV-2" was the very first domestic radio receiver manufactured for free sale to the public. The kit itself included a radio receiver, a crystal galenic detector, a one-ear or two-ear telephone at will, a bronze antenna cord, insulators, and an antenna switch to receive or ground during a thunderstorm. The radio receiver was originally designed to receive the Comintern Moscow Radio Telephone Station, operating on a wavelength of 3200 meters. Reception without voltage was possible at a distance of the receiver to 60 ... 70 kilometers from the radio station. The receiver is decorated in a wooden box polished mahogany. The outer dimensions of the radio receiver are 205x135x80 mm. Weight 1 kg.