This Wall plate volume control is ideal for schools or meeting rooms where it conveniently adds control to an 8Ohm amplifier, like our 40880, a 70V amplifier like our 40881, or any other 10k?, 3 wire amplifier that is concealed in the ceiling or another location. Designed to fit in a decorative style wall plate, the wall plate volume control is easy to install with 3 screw down terminals and can retro fit into a surface mount wall box. The volume control offers 10K? of resistance and a conveniently located mute button ensuring ease of use by a teacher or meeting leader.