Bogen Single-Zone Paging Universal Telephone Interface - Compatible With All Standard Analog Port Types -Includes 2 Audio Outputs With Level Controls, Each Of Which Can Provide Audio For 150 Bogen Self-Amplified Speakers - Telephone Interfaces: Loop Start Trunk, Ground Start Trunk, Station Access (Analog Ring-Up), Page Port Contact Closure Activation, Page Port Voice Activation - Simple 2-Switch Interface Setup - Programmable Activation Of Aux Contacts - C-Form Contact - High-Impedance Transformer Isolated Background Music Inputs With Volume Control - Override Paging (Using Loop Start Trunk Or Page Port Contact Closure Activation) With Zone Group - Night Ringer (Contact Closure Activation) - Tone Triggers (Tone And Duration Selectable, Closure Activated) With Individual Zone Groups - Tone Burst (2 To 7 Seconds), Chime Or Slow Whoop - Non-Volatile Memory For Setup Data (Nobackup Battery Required) - Setup Tone To Assistin Volume Setting - Pluggable Terminal Strips - Microcontroller-Based Operation - Dtmf Programming - Dtmf Block To Help Suppress Dtmf Tones Over Paging System - Programmable Timers Control Page Duration (Station And Trunk) - Wall- Or Rack-Mountable - 2 Year Manufacturer's -( 20) Bogen Power Units Bguti1