This mountable mono PA volume controller is designed for 100 V line systems and incorporates an audio transformer and a 24 V emergency priority relay. It provides attenuation in 11 steps and has a white plastic front panel and knob. Connections are provided via screw plug-in terminals. The unit is intended for flush mounting and is rated at 20 W RMS, with a frequency range of 50 to 18,000 Hz. An optional finery housing is available.