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Radio battery "RP-4" from 1929 produced the Leningrad Radio-Apparatus Plant them. Kozitsky. Receiving portable device "RP-4" (Radio Navigation, 4-lamp) is used for receiving in non-stationary conditions of broadcasting stations in the range of 300 ... 180 meters to an electromagnetic "Record" loudspeaker and is a suitcase in which the four-lamp receiver is placed according to the scheme and electrical data similar to the receiver "BCHN" ("BCHK") and differs from the latter in that it is mounted on one horizontal switch panel inserted into the suitcase. Electromagnetic loudspeaker mounted in a suitcase on a folding board and equipped with a stand. The suitcase also contains dry batteries for powering the incandescent and anode circuits. The size of the suitcase 650h400h210 mm. Full weight ~ 18 kg.