| Operating frequency range, Hz | 200 – 4000 |
| Sound pressure level of the telephone at a frequency of 1000 Hz, not less than, dB | 100 |
| The module of the electrical impedance of the telephone at a frequency of 1000 Hz, Ohm | 1300 ± 260 |
| Output voltage of the transmission path, not less than, mV | 7 |
| Supply voltage of the transmission path, V | 1,5 - 3 |
| Weight, no more | 60 г |
