Controller for channel selection and volume control. Up to 99 programmable channels and volume control (0-9). Installed in the local zone and connected to the system via bus. RS-485 bus, maximum communication distance 1200m. 4-P terminal block. Auto-lock function. DIP channel selector. 2x8 LCD display. Dimensions (L x H x D) 86 x 56 x 40mm. ABS enclosure. Colour white.