C-SERIES 2-GANG KEYPAD (NON ERP COMPLIANT)... The MDK-C6 Multiline Display Keypad is a wall-mounted, standard fit, double-gang keypad for C-Series Controller Amplifiers. The keypads gray scale LCD screen displays real-time information including playlist, channel, artist, song title, genre and more when used with Russound Smart Sources. Responsive hard buttons offer access to virtually every system feature and source control function. The buttons and screen brightness are adjustable and can be dimmed at the owners discretion. Replaces model MDKC5