Product review (5 stars): Hey man, that's cool!
Get it? GET IT?!

That's a thermodynamics joke. These little Peltier coolers, which also work as heaters, are pretty nifty. They are really resilient little devices and don't suffer from the normal issue of degradation on exposure to moisture like other Peltier modules because they are completely sealed. The one downside, and it really wasn't all that big of a deal for me as evidenced by the 5-star rating, is the lack of documentation with the modules.