Product review (4 stars): Get it cold before you use it.
Purchased this cooler for a trip to Colorado. Tried it out at a recent birthday party for our grandson. Kept can pop and two litters right at 40 degrees in our garage on an 85 degree day. Hope it works that well using the 12 volt plug in my truck. We did plug it in overnight to get it cold before we used it. But that's not a problem.