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Ear phone "TM-2" was produced since 1961 by the Tula factory "Octava". Longevity in production. With indices A, B, B, M, etc. except for the plant "Octava" was produced by other plants in the country, including the Moscow plant "Rhythm" until the early 90s. Designed for individual listening to the sound with household equipment with socket Ш2П. The frequency range is 200 ... 3000 Hz. Unevenness of the blackboard 18 dB. The average sound efficiency of at least 8 Pa.