Remote controller assembly Remote controller includes front-board、PCBA、backboard (with clip) and holder-board. Connecting the backboard to PCBA board according to sharp, then cover the front-board after fastening them together with screw. Holder-board is designed in order t to user hold controller more convenience. It will connect together so long as you clamp holder-board with the clip of backboard. Host assembly The host consists of front-board、PCBA and backboard.