Controller for channel selection and volume control. Up to 99 programmable channels and volume control (0-9). It is installed in the local area and connected to the system via bus. Bus: RS-485, maximum communication distance of 1200 m. Terminal block 4-P. Automatic locking function. DIP channel selector. 2X8 LCD display. Dimensions: 86x56x40mm. ABS housing. White colour. Weight: 110 g.