Bogen TPU35B 35-Watt Telephone Paging AmplifierBogen model TPU35B is a wall mounted telephone paging amplifier rated at 35, 60, 100, and 250 watts, respectively. All models can also be rack mounted*. These TPU amplifiers permit paging from telephone and or microphone; music input through an RCA jack or screw terminals; and voice activated, variable level, music mute with fade back after page. These TPU amps include a night ringer which sends an electronic ringing tone signal through all speakers,