This module adds 4 buttons when used with a Control Module. Button modules must be wired sequentially i.e. UC2 - C4 - M4 - C4 - M4 = 18 Buttons Power for backlighting is provided by the ribbon data cable from the Control Module (Requires a 12V Power Supply to Control Module) The C4 is differentiated from the M4 by a heavily populated green circuit board.
