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Small-sized radio receivers "Svirel-RP-406", "Svirel RP-306" from 1988 and 1989 produced the Orsha Red October plant. The receivers are the same, according to the scheme and design are similar to models of the type "Selga-309" and are small-sized SV, DV superheterodyne, assembled on one multifunctional chip of the K174XA10 type or its foreign analog, KP-303 field-effect transistor and several radio components. To improve the quality and loudness of the sound, an acoustic unit is included in the package with radio receivers, which consists of a larger diameter and with the best electroacoustic parameters of the loudspeaker and a separate 6-volt power supply (batteries and external source), instead of 4.5 volt supply receivers in standalone mode . The main characteristics of the receivers: Ranges: DV 148 ... 285 kHz and CB 525 ... 1607 kHz. Sensitivity in the ranges: DV 2.5, SW 1.3 mV / m. The adjacent channel selectivity is 30 dB. The range of reproduced sound frequencies in a standalone receiver is 450 ... 3550 Hz. The frequency range reproduced by the acoustic unit is 250 ... 4000 Hz. Nominal output power when operating in autonomous mode 100 mW. With an acoustic unit of 200 mW. The maximum power is 200 and 500 mW, respectively.