RockShox Reverb AXS A2 Dropper PostThe RockShox Reverb AXS is a wireless electronic dropper post designed for seamless operation with minimal effort. Key features include Vent Valve Technology for easy service, lower friction IFP for faster actuation, and AXS technology for customization via the AXS app. It is compatible with both round and oval saddle rails, has various travel and post length options, and is approved for e bikes. The AXS controller is sold separately.