This surface-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. The unit uses screw plug connections and is suitable for flush mounting. It is rated at 120 W RMS, covers 50 to 18,000 Hz, and measures 8 × 6.7 × 8 cm with a weight of 0.34 kg.