Product review (5 stars): Working great!
I purchased this to replace a peltier of the same rating from my Roadpro travel cooler and it worked fine.  I contacted the seller prior to delivery about which side would be the hot side and I was correctly advised that the hot side would be the unlabeled side of the peltier when power was supplied to the red insulated wire.  Installed with Arctic Silver thermal material and it fixed the broken cooler.