GDSTIME2-Pack 50mm USB Fans with 3 Speed Control, Mini 5V DC Brushless Computer Cooling Fan for Projector VR Gear Raspberry Pi TV Box Small Appliances Series Replacement

The problem I had was that the external hard drives connected to a NAS built on a mini-pc in a homebuilt rack would run warm if a backup started while I was out of the office and the air-conditioning was off. The possible solutions were either to leave the A/C on all the time, which was stupid; or to buy some fans, which seemed like a much smarter choice.So I bought these fans and banged a few more pieces of wood onto my homebuilt rack to hold them in place. They're just wedged in there between the wooden rails on the top and bottom, pointed so the air flows toward the back, over the four external hard drives.The idea works. I had the A/C off most of the say and there were no S.M.A.R.T. warnings. The drives seem very happy now.These fans have no speed control, so they run full-bore all the time and are a bit loud as a result. I was going to wire one in, but I don't hear so well anymore anyway so I decided not to bother.The fans seem well-made. They move a lot of air. I didn't measure how much air they move, but it's enough for my purposes. The hard drives are now cooler.The finger guards should guard adult fingers okay; but I think a toddler might be able to get their fingers in there if they tried hard enough. I don't have a toddler handy to test that hypothesis, however; so I'll just advise you to not use these fans where toddlers with a love of science might want to test my theory.In summary, they're good fans. They spin around and move air, and they do it very well. Since that's all I expect of a fan, I'm giving these air-movers five stars.

Very pleased with the quality, and the accessory package that these fans ship with especially for the cost.They seem well made and both worked flawlessly out of the bag.The addition of protective grills, and the 2-1 USB splitter cable is very nice, and was useful for my application.I will say, I underestimated just how loud 25 decibels would be when positioned by my laptop on my desk.I imagine if I was not seated so close to them it wouldn't be noticeable, but its similar to the laptops fans when working hard.Overall I think these are a good value, but I am going to have to spend some extra money to get a fan-speed controller to slow (and quiet) these down just a bit.

These fans are easy to install. They connect by a USB connector and using a phone charger block makes it easy to run.

The cords are short and I needed to supply the plugs. It makes noise, but it isn't loud. I don't think I would purchase again, just because of the cord length. It works good 👍

Perfect for the installation I did. Cools my drives from the outside and keeps me cool too (in California) - have 4 installed. Like how they did with the protection frame. Small and light

A little small but still worked well

Awesome

I got these fans to use w/ a wifi router that runs hot in an even hotter the attic. This was packaged well and came exactly as described. I appreciate the fact that this arrives w/ a grill when most fan set ups do not. It had everything I needed to get these installed and running quickly. Air flow isn't the strongest but this is plugged into a 5v slot. Might run faster if the input was more. Either way, does what it needs to do and would highly recommend these to anyone wanting to cool down their devices!