you are bidding on a used but tested Koolatron 12v model P20 which is an 18qt size. I plugged it into a 12v and it started right up, I tested both the hot and cold functions and I was surprised how cold and warm it got within a short amount of time. the item itself is in great shape but the box has definitely seen better days. the original instructions are also included. there is a slight must smell that I think just needs to air out for a couple of days but other than that this is a great way to keep more items in your cooler since you don't need any ice.