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I didn’t expect much and thought it was just a cool-looking gimmick with colorful LED lighting. I was wrong. The back of the small fan gets extremely cold. I measured its surface temperature with my infrared thermometer, and it registered as low as 50.5°F while my room temperature was 80°F. The temperature difference is very noticeable. But that was without being mounted on my phone. To mount it on my phone, I had to use the adhesive magnet as my phone doesn't have a magnetic back and it's too wide to attach the fan with the included clips. It holds though and keeps my phone cooler indeed. The fan is square-shaped, with sides measuring roughly 2 ⅜ inches. It seems to have three cooling levels - L1, L2, and L3 - which cycle when I press the power button repeatedly. However, I’m not sure what the changing numbers mean after selecting a level. Since there’s no built-in battery, I power it via a USB port or my portable power bank. Unfortunately, the LED lights can’t be turned off, which would extend the power bank’s battery life. On the other hand, I find the lights too cool looking to turn them off.