Single Line Paging Controller with CD Quality Sounds. The SLP-4 Single Line Paging Controller will allow you to page family members or co-workers from any phone in your home or small office. The pages can be heard over the same speakers that are installed for multi-zone music distribution. The SLP-4 provides inputs for 4 lighted doorbell switches. The inputs select 4 different CD quality sounds from a library of eight factory recordings including Westminster bells, chimes, alert tones, barking dog, etc. Alternatively, users may record their own CD quality sounds into the SLP-4 from their PC s USB port. When the doorbell switch is pressed, background music is muted while the appropriate sound is heard over the system speakers. The SLP-4 connects in series with a single existing phone line. The unit has a built-in 2 watt amplifier, pre-amp output, music on hold input, intercom features, and selectable loud ringing. Applications Whole house/small business paging from existing phones Add paging, intercom, and music on hold features for small businesses Loud ringing / night bell Compatible with C-200, C-1000B and C-2000A Museum or information display, 4 button audio server Features Stereo line level pre-amp inputs/outputs for whole house audio systems Built-in two-watt mono paging amplifier with gain control Phone to phone intercom Place callers on music-on-hold when paging Can provide background music from an external source Background music mute (automatic during paging or touch tone selectable while you are on a call) Selectable loud ringing (electronic warble over speakers) Four doorbell switch inputs (lighted or non-lighted) for activating door chimes USB port for loading custom wave file chime tones/ sounds/music Nearly 6 minutes of recorded audio storage Switch selectable on-hold alarm tones Simple control commands - no touch tone programming Page trigger output (12V signal for enabling paging source input on multi-source amps) Individual Chime, Page, and Ringing volume controls Bypass code - ignores all touch tones on next off-hook allowing you to steer through auto attendants, etc. Page from multiple phone lines by connecting multiple units Comes complete with power supply.