Two watts of paging power All lines are optically coupled for use with fax switches and analog PABX/KSU stations Can provide background music from an external source Paging from an unused trunk port or paging port Four loud ringing sounds: Electronic warble Double gong Quadruple chime Door chime (ding-dong) Provides loud ringing or night bell, from 1-6 lines for warehouses, yards, etc. Output for controlling a 12V relay from 1-6 ringing lines Page alert tone 600ohm output for sourcing high powered amplifiers Includes one 25AE 8 ohm paging horn (can support a maximum of 3)