This is a mounting option for an upgraded external controller for the RAD Rover 6+ ebike. It basically gives the controller a flat surface to be mounted to behind the bike's seat tube. The mount can be attached to the seat tube with Gorilla mounting tape (or similar), and the controller can be attached to the mount the same way, it's a neater and more stable way to keep the controller attached to the bike instead of using zip ties or U-brackets.