Wathai 75mm x 15mm USB Cooling Fan 5V DC Brushless Turbo Small Computer Case Blower Fan for Cooling Electronics, Hard Hat, Helmet, and DIY Projects

Works great. Threw it on a 3d printed bracket and mounted to an external gpu. Keeps the temps nice and low.

Moves a lot of air for their size. Quite on low setting. Loud on med-high. Grate for keeping amps or electrics cool for best longevity and proformace!

PROS: This fan works. Hooked it up directly to USB Power supply and it drew air and will be ready for hot days to help pull hot air out of my computer from outside the enclosure. Comes with a guard to help keep foreign objects from getting caught in the fan. CONS: I ordered the 120MM fan so that I could get a sliding switch controller as I suspected there may be trouble with the button switch controller. Hooking first time using the controller FAN would not work at all. Fan only worked when hooked directly into power supply. Yes I'd buy this again.

They have a noise but it's a soothing noise, like air. I wouldn't complain about it and they're nice and slim.

Used to cool sfp in a cabinet. Unit had been running on med speed for over 1.5 years. Still going strong.

I had a problem with heat when I mounted my router vertically. I made a plenum out of 1" square stock and glued foam to it as shown. I hot glued the fans to the backing board. I then mounted my router, set the fan power to mid range and heat problem solved. That worked so well I also bought another set of fans to cool my modem. Again, hot-glue was used to mount the fans as well as to provide sealing the area around the base of the modem. Very Effective.

Made a box to dry beef to make biltong (South African jerky of sorts). Used one fan to blow in, one fan to exhaust, and an old Apple iPhone power cube runs it all. Awesome solution. Fans are very quiet, but I also ran them on lowest setting (for a week!). Tiny fans, quiet, nicely adjustable.

Compre 3 pares del mismo tamaño, 2 llegaron bien y una de un tamaño más pequeño y que para el proyecto que estoy realizando no me sirve!!!

Work great for 3d printer exhaust fans

rec'd as described

Perfect, no noise , big enough to cool multiple raspberry pi devices with 5v

this little fan is so cool it usefull at a point i cant live without it! any projects i build i can use this to cool the systems down very fast and it reliable using USB with a spe ed switch 3 speeds on it. Very quiet fan. about 75% less noisy than other same kinda fans

One of the two wires wasn't soldered, and was hanging loose. So the fan is useless unless I buy a soldering iron to fix it, which costs as much or more than the fan did. Edit: Updated my review from 1 to 3 stars, as seller messaged me and promptly offered a full refund. The item's original condition was unfortunate, but seller was very helpful in rectifying the situation!