OMNITRONIC PA Vol Contr/Prog Select 5W mono bk is a flush-mounting analog PA program selector and volume controller for 100 V audio systems or other mono signals. It selects between six signal sources and provides attenuation in 11 steps. The unit features a built-in 24 V emergency priority relay, black plastic front panel and knobs, screw plug connections, and an optional finery housing. Rated power is 5 W RMS, with a frequency range of 50–18,000 Hz.