Product review (4 stars): Mini USB-Powered Fridge Cooler
Just received this device. It seems to work well. What is nice is that you don't have to connect it to a USB port on a PC or laptop if you don't want to. It works with most powered USB ports that put out 5.0 V DC. The user manual is not real clear on how to power up except to plug it in and it starts working. My unit came with a rocker switch in the cord with three positions. I, 0, and II. 0 is the middle position and the unit is off. When I moved the switch to the I position, it blew my 1 amp blade fuse that is on my DC power distribution that supports two USB power ports. In the II position, the unit works just fine. I would be careful using the I position in a PC or laptop USB port as this might cause damage. The packaging (box) states there's on-line support but no URL listed, nor any mention of manufacturer or country of origin on the box or user manual (no labels  or stickers on the unit either). Other than that, I think this is a good product, but time will tell. I took a star off  for poor user manual documentation and a potential short on one of the on positions. Your mileage may vary.