- Single door answering device - Push a button to initiate two-way communication from the door speaker to telephone, then dial a programmablecode to unlock the door- Activates door locks- Door unlock contact closure (strikeplate required)- Alarm functions- Transmit and receive volume control- Background music input with volume control- Built-in ring generator with on/off switch- 3 Distinctive ring patterns- Programmable options include door unlock codes, number of ring cycles before door request is terminated, time the door remains unlocked (per door)- Requires -24 Vdc, 600 mA (filtered) 10 Vac lamp- Access: PBX loop start trunk port, electronic or 1A2line key (line card required), or dedicated single line phone set- Input impedance: 600 ohm- Ouput impedance: 45 ohm- Music level: -10dBm nominal- Music input 4 to 600 ohms- Power requirement: -24 Vdc, 600 mA- Weight 4.8lbs- Dimensions: 8.6"H x 11"W x 2.3"D- VALCOM POWER UNITS (-12)VCV2901A