One-Way, 1 Zone, Enhanced Page Control with built-in power provides a background music input with voice operated mute, a battery back-up input, tone generator, page override and Phantom Zoneâ„¢ capability which enables paging to all speakers, but limits music to only selected speakers.- Telephone System CO Port Access.- Page Port Access.- Page Override.- Background Music Input And Volume Control.- Page Outputs With Or Without Music.- Internal Tone Generator With Volume Control.- Battery Feed Switch For Loop Start CO Port Access.- RJ 11 Modular Plug For Page Access.- AC Powered.- Battery Backup Input.- Switch Selection Of Tones/Output.- Built-in Power.- Will Work With Single Line Telephone For Access.- UL/CSA/CE.