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The radio battery type "PL-2" from 1929 produced the Moscow plant Moselektrik. "PL-2" stands for Receiver, Lamp, 2-lamp. The wavelength range is 300 ... 1700 meters. The receiver could work as a detector, as a detector with an amplifier, as a regenerative single-tube and a regenerative 2-tube, the second radio tube was used to enhance the low frequency and finally it could be used as a single-tube low frequency amplifier. In addition, in the receiver it was possible to use lamps of the type "Micro" and two-grids "MDS-2", which worked at low anode voltage. The antenna is tuned with a variometer equipped with a folding vernier and fixed capacitors switched by means of a contact switch. Feedback is set using the communication variometer. Low frequency boost on the transformer. It gives the possibility of receiving (on the lamps) local or nearby stations in the presence of not very large noise on the loudspeaker (Liliput, Record) and some distant ones on the headset. The price of the radio is 40 rubles.