The AIM AIR tire inflation station is designed for automatic tire inflation with a digital controller. Set the required air pressure and attach hose to tire with clip-on hose end. Unit will automatically inflate the tire to the desired pressure and signal when finished. Remove the hose and let the self-retracting reel pull the hose back into the cabinet. Unit operates on 120v/1ph/60hz power and delivers up 90 psi pressure.