Review on 🌬️ Sunon KD0501PFB3-8 5V 2010 20x20x10mm Cooling Fan (2 Pack) - Small Mini Micro C12 by Ari Tanner

They have to send two fans for a reason as one of my fans was not working when it arrived and only twitched briefly when power was applied became. That's 50% bounce right out of the box. Very frustrating, but I'm assuming this is a random bug and not an indication of poor quality control. The second worked fine but I needed two fans in series. They were cheap so returning them will probably cost more than it's worth, which is why I'm stuck with a dead fan. Aside from the high failure rate I've experienced, the fans are small, quiet, and draw 200mA, so you can easily plug in their fans for portable 5V battery operation.