Review on USB Radiator Fans - Essential Cooling Accessories for Valve Index VR Headset, Enhancing Gaming Experience and Prolonging Device Lifespan by Christopher Gonzalez

Fits well in trunk, quiet, blows out quite a lot of hot air. Definitely worth buying, no doubt does exactly what makes it more expensive. The button is loose and can vibrate a bit when it's on - this is easily fixed by sticking a piece of paper or tape in there. Since installing this fan, my index has stopped heating completely. Seriously, no more sweaty issues or dropped frames. It removes the heat completely. I would say such a fan is 100% necessary, it's weird that a thousand dollar headset didn't come with it at all. I'll update my review if anything goes wrong, but so far it's been a great update.