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Since 1926, the P-2 detector radio receiver has produced the Leningrad Telephone and Telegraph Plant named after Comrade Kulakov. Radio "P-2" is designed to receive radio stations on high impedance headphones in the range of 300 ... 1500 meters, which corresponded to the waves of existing and under construction Soviet radio stations. At one time, with an antenna 30-40 meters long, raised to a height of about 20 meters and grounding, it was possible to receive broadcasting stations with a power of 1-2 kW at a distance of 250 kilometers with sufficient volume.