Whole house/small business paging from existing phones Built-in two-watt mono paging amplifier with gain control Phone to phone intercom Page from several different phone lines by connecting multiple units Music on hold Caller on hold Can provide background music from an external source Background music mate (automatic during paging or touch tone selectable while you are on a call) Selectable loud ringing (electronic warble over speakers) Doorbell switch input (lighted or non-lighted) for activating door chime (ding-dong sound over speakers) Unique front and back door chimes when used with a C-1000B or C-2000B doorbox controllers Switch selectable On-Hold alarm tones Stereo pre-amp input and line level output for use with receivers and high wattage amplifiers Simple control commands - no touch tone programming Page trigger output (12V signal for enabling paging source input on multi-source amps) Pre-amp volume control Bypass code - ignores all touch tones on next off-hook allowing you to steer through auto attendants, etc. Comes complete with power supply