Includes the SRAM GX Eagle AXS rear derailleur with battery, Eagle controller with clamp, charger with cord, and chain gap tool The GX Eagle AXS rear derailleur shifts on command, whether under climbing load or sprinting to the stage finish, and is smart enough to protect itself thanks to its incredibly resilient Overload Clutch The GX 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 GX Eagle AXS Upgrade Kit (rear derailleur with battery, controller with clamp, charger/cord, chain gap tool). No matter if you are looking to upgrade your ride, or looking for great value replacement parts, look no further than the GX AXS upgrade kit. With the GX AXS upgrade kit, riders can enter the realm of wireless drivetrain simplicity without the need to purchase an entire groupset.