| Input Power: | 13.0 VAC RMS/300 mA with supplied adaptor or filtered 12 to 14 VDC/300 mA source |
| Intercom Output: | 50 mV (Low) or 330 mV (Hi) RMS into 300 ohm load typical (at rated deviation) |
| Intercom Input (Gain Minimum): | 300 mV RMS typical (for rated deviation) |
| Auxiliary Output: | 430 mV RMS into 600 ohm load typical (at rated deviation) |
| Auxiliary Input (Gain Maximum): | 60 mV RMS typical (for rated deviation) |
| Local Headset Input: | 2 mV RMS input nominal; 1.5 mV RMS input at compression (Dynamic) |
| Local Headset Output: | 32 mV maximum output into 600 ohm |