Not gonna lie, I bought this kinda as a joke, just to see if it worked. And it actually works. Its not the best quality in the world, but the fans have speed options while in battery and are kind of in auto mode in the solar. Micro usb for charging. The hat itself is a little too big for my head, and the cord does not seem to adjust it very well, but I can still use it no problem. The fans are also a bit too heavy for the hat itself. It does not cause discomfort on the neck though. And lastly, I wish it had a little cover for when I do not want to use the fans. I guess I'll have to put some buttons and make it myself.