Mountable PA program controller for 100 V audio systems and other audio signals. The unit selects one of six signal sources and routes it to a single speaker output. It features a 24 V emergency priority relay, aluminum front panel and knob, screw plug connections, and flush-mount installation. The optional finery housing is available separately. Dimensions are 8 cm wide, 6.7 cm deep, and 8 cm high; weight is 0.11 kg.