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 paging 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 dogs, 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 paging 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.