Bogen 100 watt wall-mounted telephone paging amplifier- Inputs for 600-ohm balanced telephone line, Lo-Z balanced microphone, and background music- Music input RCA jack or screw terminals- Integral automatic level control ALC circuit for controlling pages made by persons with varying voice levels and paging techniques- Page from telephone and/or microphone- Signal-activated paging channel automatically mutes background music- Adjustable background music muting level during a page- Music gradually returns to its normal level after a page- Audio Enhancement circuit increases intelligibility, improves perceived loudness with no increase in power, and reduces listener fatigue- Separate controls for page volume, music volume, night ringer, music mute, and Audio Enhancement- Bass and treble controls- Built-in night ringer activated by contact closure or by 90V ring signal- VOX sensitivity level control eliminates accidental transmission of background noise from a paging telephone- Thermal and electronic overload protection- Jacks provided for bridging additional TPU amplifiers- Brackets are attached to each model for easy wall mounting; the TPU250 can also be rack-mounted with included brackets; TPU-B models can be rackmounted with RPK82 mounting kit sold separately- Peak level indicator lights when amplifier is driven into clipping- 120V AC, 60 Hz power source- Listed to UL Standard 60065 for U.S. & Canada