Shift controller for Eagle AXS componetry Shift under load, over the roughest terrain, uphill, without changing your grip on the bar Touchpoints that are totally customizable to your preferences, allowing you to choose which button does what through the AXS App Customize in-board and outboard shift options Pairs with both XX1 and X01 Eagle AXS derailleurs System is completely water and dust proof to IP69K AXS Right 12s 1 to 1 Black