Bought this adapter to work with the Koolatron P-20 cooler (/warmer), but unfortunately after 30 minutes of cooling indoors it began to emit a burned resistor smell. And when I picked it up, it was very hot to the touch. Not good signs, from my experience.Comparing it to my AC-to-DC adapter from Igloo, it's much lighter and seems to be under-designed. You can't fool Mother Nature--increased weight usually means greater power handling capacity. In this case it just isn't there. Overheating isn't what I bought it for, either. In contrast, the Igloo adapter works endlessly with getting overly hot or giving off a smell. It weighs almost twice as much, too, which seems to be related.Save your time and money and get something more capable. You'll be glad you did. Amazon has been breathtakingly cooperative in this matter, by the way, at least so far. Free return shipping and emailed labels are the way it should be done.