The WK-B adaptor is required with GE Caliber and Altitude High Wall indoor units. The WK-B is installed either next to or above the wall for an unobtrusive installation. It connects to the PCB inside the wall unit through one connection and then from the WK-B to the Wired Wall Mounted Controller through another connection.
The WK-B includes a mounting plate, front cover, PCB and 3 ft wire cable.