The easiest tool to use. One button control. The hardest part was figuring out how to put my car in "learning mode" as the car's manual was wrong (see video). valve stem, press the button and the car horn beeps once, go clockwise to the next and so on until it finishes, the last one beeps twice. I read that someone put a cardboard pad in the battery compartment to prevent the battery from draining when not in use. I found it easier to turn the battery upside down and got the same result. (disabled). I have used this on my 2014 Chevy Impala and also on a 2013 Chevy Equinox, worked great on both.