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The TMG-4 and TMG-5 telephone and microphone headsets have been produced since 1969 by the Oktava Tula factory. Designed for recruiting classrooms for learning foreign languages. Headsets differ in the resistance of headphones. In the "TMG-4" model - high-resistance (about 3 kOhm), in the "TMG-5" - low-resistance (about 200 Ohm). Microphone sensitivity 0.8 mV / Pa. Headset dimensions are 295x200x80 mm. Weight 0.35 kg. Cord length 1500 mm.