- controller not included.Our intention with Reverb™ AXS® was inventive and pure. No hoses. No routing. No energy wasted. Not a single thing in the way of the experience. We 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 AXS™ technology, a new level of interaction, personalization, and connectivity across all AXS enabled components.Features:- NEW Features Vent Valve Technology for super simple service if the need arises without any disassembly of the post- NEW Lower friction IFP allows for faster actuation of the post and less force needed- AXS Technology allowing for customization to an individual rider's liking via the AXS Mobile App- Shared battery with all other SRAM AXS enabled components- System is completely waterproof to IPX7 rating- Compatible with 7mm round rails and 7x9mm oval railsSpecifications:- Post diameter: 30.9mm- Travel: 125mm- Post length: 390mm- Saddle Rail Compatibility: Round/Oval (7x9)- E-Bike Approved: E-bike Approved w/E-MTB Decal