Description: ?- Bogen 250 Watt Wall-Mounted Telephone Paging Amplifier- Inputs For 600-Ohm Balanced Telephone Line, Lo-Z Balanced Microphone, And Background Music- Integral Automatic Level Control 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- Aphex Aural Exciter Increases Intelligibility, Improves Perceived Loudness (With No Increase In Power), And Reduces Listener Fatigue- Seperate Controls For Page Volume, Music Volume, Night Ringer, Music Mute And Aphex Aural Exciter- Bass And Treble Controls- Built-In Night Ringer Activated By Contact Closure Or By 90V Ring Signal- 25V And 70V Outputs Available- Vox Sensitivity Level Control Eliminates Transmission Of Background Noise When Paging From A Telephone- Thermal And Electronic Overload Protection- Jacks Provided For Bridging Additional Tpu Amplifiers- Brackets Are Attached For Easy Wall Mounting- Peak Level Indicator Lights When Amplifier Is Driven Into Clipping- 120V Ac, 60Hz Power Source- Ul And Csa ListedTpu250