Destined for use as a part of communications facilities. The set has no sound protection.

Technical data
Power supply voltage, V 60±6
Output voltage of the electroacoustic receiving path during the action of the noise signal of speech spectrum with the 102 dB level on the set's microphone on the condition that the microphones acoustic line's inlet is within 15 mm from the sound source , mV 700-1000
The set includes the options of adjustments of the output voltage within limits (400-1600) mV during the operation with the help of the variable resistor, installed into the amplifier's circuit board.
Impedance of the electroacoustic receiving path of the set at the frequency of 1000 Hz, Ohm, no less than 600
The reception coefficient of the electroacoustic path at the frequency of 1000 Hz, Pa/V, no less than 8
Weight without cord, kg 0,040±0,005