It's like breaking off a piece of ice on the back of a phone, except the ice doesn't melt. (I originally thought it was cooled by 2 fans pulling hot air behind the phone.) But this piece of "ice" works pretty well, you can really feel how cold your phone is from the front screen. Conclusion: I keep it! (I've only been using this cooler for a week and will update it once if it breaks.)
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