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The in-ear phone "Electronics TM-8" has been manufactured since 1988 by the Leningrad plant "Magneton". Designed to listen to the sound of household equipment. The nominal frequency range is 30 .... 15000 Hz. The diameter of the plug is 2.5 mm. Nominal resistance 32 ohm. The rated input power is 0.15 mW. Weight 27 g