The Halo is a must have in ALL cars! I am an impossible sale. My neighbor jumped at the chance to show me how it works when my battery went dead. Jumped my car in less than 30secs. I then drained the battery in my truck just to see if it would jump my Chevy 2500 HD. It too jumped immediately first try. After both jumps Halo still had 4 bars. I bought 3 immediately for all my vehicles. Can’t wait to catch the Halo with the air compressor so i can gift these to friends and family.