The dreaded light came on and I knew I needed to fill up my tires but waited and waited until after a few weeks I looked at my tires and saw my rear left tire was very flat. So I ordered it and it arrived the next evening. It was very easy to use! I was shocked my psi dropped to 17 when it should have been 36! Thank God I have this air pump! It only took two minutes to fill it from 17 to 36psi! I definitely recommend it! It will automatically turn off when it reaches the desired psi level!