- Single door answering device - Provides two-way communication (does not provide door unlock capability) - Built-in talkback amplifier - Ring generator - Transmit and receive volume control - Includes a VC-VP-324 power supply - Compatible with all Valcom doorplate speakers - Access: PBX loop starttrunk port electronic or 1A2 line key (line cardrequired) or dedicated single line phone set -Input impedance: 600 ohm - Ouput impedance: 45 ohm - Weight 3.4lbs - Dimensions: 8.25inchH x 4.5inchW x 2.35inchD - VALCOM POWER UNITS (N/A power included)