RockShox created a reliable wireless-electronic dropper post and controller that actuates with drastically less effort and zero distraction. Expanding what's possible on a bike, Reverb AXS is enabled by SRAM AXStechnology, a new level of interaction, personalization, and connectivity across all AXS enabled components.Key Features:Vent Valve Technology for super simple service if the need arises without any disassembly of the postLower friction IFP allows for faster actuation of the post and less force neededAXS Technology allowing for customization to an individual riders liking via the AXS Mobile AppSRAM AXS compatible controller sold separately.Shared battery with all other SRAM AXS enabled componentsSystem is completely waterproof to IPX7 ratingCompatible with 7mm round rails and 7x9mm oval rails