Intended for silent call and two-way communication when working with Vertex radio communication sets.
Suitable for operation at temperatures from minus 10 ºС to 40 ºС and high relative humidity to 95% at temperature of 25 ºС
| Average sound pressure level of the telephone in the frequency range from 400 to 4000 Hz, not less than, dB | 80 |
| Sound pressure level of the telephone at a frequency of 1000 Hz, not less than, dB | 90 |
| Module of the total electrical resistance of the emitter, Ohm | 20 ± 4 |
| The module of the total electrical resistance of the insert phone, Ohm | 30 ÷ 50 |
| Paraphonic sensitivity of the microphone, not less than, mV / Pa | 5 |
| Depth of volume control of the receiving circuit, at least, dB | 20 |
| Sensor steady-state voltage, not less, V | 1,8 |
| Weight, no more | 80 |
