| Input Voltage | AC 230 Volts - 50 Hz / DC 12 Volts |
| Air Conduction | 25 Hz to 8 KHz (Maximum 120 dB) |
| Speech | 70 dB |
| Bone Conduction | 250 Hz to 6 KHz (Maximum 70 dB) |
| Speech | 70 dB |
| Noise | Wide, Narrow & Speech Band. |
| Attenuator (Masking) | Steps of 5 dB |
| Masking Range | 0 db to 100 dB |