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The radio receiver detector "LDV-5" was produced by the Leningrad Kulakov Telephone and Telegraph Plant since the autumn of 1924. It is designed to receive radio stations in the range of 200 ... 1500 meters. The radio receiver contains a variometer, a communication switch, an extension coil, capacitors, a detector and a headset. Tuning to frequency is performed by a jump-like change in the capacitance of the circuit and a smooth change in its resonant frequency using a variometer. To the antenna of the "long wire" type, the receiver made it possible to receive transmissions of radio stations more than 100 kilometers away at normal loudness. Outside, the radio is a wooden box polished in mahogany with dimensions of 245x122x132 mm. Includes headphones.