I got one and I use it in my work vehicle to keep food and beverages cold. There have been hot days at 90 or so outside and obviously warmer on the inside of the vehicle where it runs for 6-7 hours on a car battery at the lowest cool setting which is about 38F degrees with no problems. Truck starts just fine at the end of the day. I love it and it does everything exactly like I wanted. Want to know anything else?