2 Watts of paging power, Includes (1) Viking 25AE paging horn, All lines are optically coupled for compatibility with fax switches and analog PABX / KSU stations, Can provide background music from an external source (trunk mode only), Paging from an unused trunk port or paging port, Choose one of four ringing sounds: Electronic warble (traditional loud ringer)/Double gong (two identical “gong” tones)/Quadruple chime (four descending chime tones)/Door chime (ding-dong), Provides loud ringing or night bell, from 1-6 lines for warehouses, yards, etc., Output for controlling a 12 Volt relay from 1-6 ringing lines, Page alert tone (trunk mode only), 600 Ohm output for sourcing high powered amplifiers