The LiftMaster Chamberlain Circuit Board End Panel with Green Learn Button 41A4252-7 is a replacement part designed specifically for Chamberlain garage door openers. This circuit board end panel is compatible with LiftMaster and Craftsman brands, and is a genuine LiftMaster product. It comes as a single piece in the package and is not a custom bundle or modified item. This part is essential for ensuring proper functioning of your Chamberlain garage door opener, allowing for easy operation and security.