VKEL1004 Features: * Loud ringer * Loud electronic warble, or one of three other soft chime sounds may be selected * Eliminates the installation of multiple bells, relays and paging cards * Used with electronic key systems * An external night transfer switch can be added to turn loud ringing on or off in night bell applications * Adjustable loud ringing from up to 6 analog lines * Paging is accomplished by connecting the PA-2A to a paging port or unused telephone line input (trunk port) of nearly any phone system * Easy to install Includes: * Includes power supply, amplifier and (1) paging horn