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The radio battery "LB.2" from the beginning of 1924 produced the Leningrad Telegraph Plant. The name of the receiver "L. B.2" stands for Lebedinsky, Borusevich (the names of the designers), option 2. At the end of 1924, the receiver was upgraded and from 1925 it was produced under the name "BL-2". The receiver is assembled according to the regenerative scheme, it has two contours tunable in the range of 250 ... 2500 meters. Depending on the reception conditions, only one circuit could be used. Due to the adjustable feedback, with a smooth approach to the generation threshold, the radio receiver could receive both local broadcasting stations and radio stations that were 1,000 or more kilometers away. The receiver was assembled in a wooden case painted black with dimensions of 195x175x145 mm. Radio weight 2 kg. Anode, 60 volt and filament, 4 volt batteries are used to power the radio.