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Since the beginning of 1987, the Sonata P-421C cassette player has been producing Velikolukskoe PO Radiopribor. Designed to play phonograms from cassettes of the type MK-60 to compact headphones '' TDS-13-1 ''. The MP is powered by 4 A-316 elements, while the continuous operation time is seven hours or more. The MP has a jack for connecting an external power source. At the end of the cassette, auto-stop is automatically triggered, turning off the "Start" key. The speed of the magnetic tape 4.76 cm / sec. The range of reproduced sound frequencies is 63 ... 12500 Hz. Output rated power 2x20 mW. MP dimensions - 142Ñ…95Ñ…37 mm. Weight 325 gr. The price is 130 rubles. According to the exact same electrical circuit, design and external design, the plant was not yet installed, it produced a cassette tape-player, but under the name "Edelweiss P-421C".