Parameter specifications 1. Host power supply AC110V-220V/50Hz 2. Microphone unit interface round head DIN-8 socket interface x2, RJ45 network cable interface x4 3. Audio output auxiliary OUT VOL (knob) x1 4. Total audio output BAL OUT (3-pin Canon port) x1 5. Audio input auxiliary AUX VOL (knob) x1 6. Audio recording output AUX OUT (Lotus socket) x1 7. Audio input AUX IN (Lotus socket) x1 8. Central control connection port RS-232 serial port x1 9. Video matrix connection port Video (9-pin) x1 10. Phoenix Connection Interface Video RS422 (5-pin) x1 PELCO-D/485 T -/B T+x1 11. Small eight core serial port Video RS-232 (small eight core) x1 12. Frequency response 20Hz-20kHz Signal to noise ratio>96dBA Total harmonic distortion<0.05% External dimensions (L × W × H) 483 × 323 × 90mm Color Black Installation method: 19 inch standard cabinet