Quite possibly the best wireless derailleur ever made, the SRAM XO T-type unit is almost everything you could want. Unbelievably tough, the hangerless interface also makes it exceptionally stiff for exceptional shifting precision.
Easy to pair with all SRAM AXS shifters via the user friendly app, the XO mech is essentially maintenance free once set up and runs on the AXS batteries shared with many other SRAM components. Their innovative overload clutch will pull the mech out of the way of impacts in an instant and should you be unlucky enough to damage a cage or eventually wear out parts then much of the mech is easily replaceable allowing for a long service life.
Use with either 500% or 520% SRAM cassettes.