- 1 Zone one-way analog page control - Background music input with voice operated mute - Page override for special priority announcements - Battery back-up input - Built-in power - UL listed - Access: page port PBX loop-start trunk port electronic or 1A2 line key (line card required) or dedicated singleline phone set - Input impedance: 600 ohm - Music source impedance: 4 to 600 ohm - Music input level: -10dBm nominal - DC output: -24 Vdc @ 600 mA - Power requirements: 120 Vac/1A - VALCOM POWER UNITS (+12)