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