The SRAM XX1 Eagle AXS Upgrade kit includes all of the electronic shifting components needed to introduce customizable AXS technology to your Eagle drivetrain.The XX1 Eagle AXS Rear Derailleur is compatible with 10-52t Eagle cassettesIncludes the SRAM XX1 Eagle AXS rear derailleur with battery, Eagle controller with clamp, and charger and cordThe XX1 Eagle rear derailleur provides instantaneous shifting from a single touch, even under the heaviest of loads, and features a shorter cage that allows for 10mm more ground clearance and more chain wrap on the cassetteThe Eagle AXS controller offers a unique wireless shifting experience with ergonomic touchpoints that are customizable to your preferences - you can choose what each button does through the AXS App