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The TMG-8 telephone and microphone headset has been produced since 1985 by the Octava Tula plant. The headset is designed for completing lingophone cabinets, for listening to sound programs from household electronic equipment for the hearing impaired. Specifications: Operating frequency range 30 ... 18000 Hz. The sensitivity of the phone at a frequency of 1000 Hz - 12 mV / Pa. Paraphone sensitivity of the microphone at a frequency of 1000 Hz - 0.8 mV / Pa. Headset weight 350 grams.