If you have an unassigned button on your AXS Stealth Controller, you can assign it to control other AXS components, including RockShox Reverb AXS, RockShox Flight Attendant override, or ANT+ functionality with the Karoo cycling computer.
Please note that the AXS Stealth Controller is designed to mount between the clamp and a mechanical dropper post remote. It requires that a mechanical dropper post remote is installed to hold it in place, as the mounting hole is not threaded.