Easy to use, just remove the valve cap, push down, turn the lever down to lock, set the desired tire pressure. Daughter, she had the tire warning devices on. She completed all four in seconds. Checked with the new gauge I sent, it was there. I reset the warning light and no more problems. You must remember that a NEW CAR DEALER will check the tire pressure before shipment. I will be buying one for my wife's car and truck.