2Pack Wathai 40mm x 10mm Mini USB Fan with Speed Control 5V Small Computer USB Fans for Welding Helmet, Aquarium, Terrarium, Camera, VR Receiver DVR PlayStation Xbox Computer Cabinet Cooling

These are small in size but moves lot of air. I am using it in one of my devices with Raspberry Pi to basically mover air from the case. It cools everything very effectively. Its loud at full speed, I drive these at lower voltage to reduce its speed slightly and the noise. I am not sure how long it will last but so far it seem fine in build quality.

Ordered these as I was needing some small and quiet fans for air circulation in a tree frog terrarium build. I had previously taken measurements of the clearance on the underside and top of terrarium top so I knew exactly what fans would fit perfectly into the position I had planned. Now, when these fans arrived in the mail, I did another careful measurement of the exact hole size needed to match up with the fan blade width. Along with pre-drilling the necessary screw mount holes. Everything was going as planned and was looking nice. On a side note, I had also ordered black metal mesh covers that would fit these small fans as I didn’t want any tree frog fingers going into those fan blades. :) after gathering up the screws I needed , I got to work getting everything mounted into place. Listen, I couldn’t be happier with how well this worked out. Not only does it work good, It looks like a professional factory installation. But I’ll let you be the judge by the photos I have added. The only thing left to do now is get the wiring to run down the underside bottom edge of inner lid. Since that will be a cakewalk, I will work on finishing that part first thing tomorrow. As for these fans I ordered here, these are perfect. They have speed control switch and I noticed that I could probably just run these on low for more than ample air circulation. You would be surprised by how quiet these are for how much air they push. That along with they aren’t creating any unnecessary vibrations or annoying sounds. I was worried I was gonna have to use a diy thin rubber gasket to mute that situation, but happily it wasn’t needed. These would definitely push more power than I would ever need for a terrarium, but like I said earlier, running these on low not only cuts that air flow down, but also keeps them at their quietest setting. I honestly can’t even hear these running while standing right in front of the tank. Now I can’t speak to how well these are at helping cool PC computer parts, And I can’t attest to how long the lifespan will be on these but I can tell you these were exactly what I needed for my project and worked perfectly for my personal needs. So maybe somebody reading this is looking for similar fans for a similar project. If so, these are the ones you should order. Just remember to buy those metal mesh fan covers that will fit this size of fan to keep your (inhabitants) safe. These do come with the fan grill covers, but those will not be good enough by themselves. So I used both. Hope you like the looks of how it turned out as much as I do, and I hope this review helps somebody out in some way. P.S. as another helpful tip if using these for the same purpose as me, think about pugging them into a auto timer. You can then just have them turning on and off by themselves when needed, like if you want to cool your terrarium during nighttime hours like a natural ecosystem. One simple way to accomplish this is to couple a/your lighting timer with these fans. For instance, fans power on at the same time the nighttime lighting clicks on, and daytime lighting powers off. If you plan on using a fogger for humidity control, it’s best to have them running on a separate auto timer. It’s best to only run them for about 20 minutes or so during the morning as the daylight lighting turns on. This creates that natural morning fog and dew on the morning grass scenario. Just keep in mind what will be living in your tank and what best suits their natural habitat, humidity, temperature, and weather situations. Have fun and create your own little world. :) if you like this review, give it a helpful vote. Thanks.

Installed as part of a dual blower upgrade for my 3D printer, an ender 3 v2. The only complaint is they worked too well and I had to turn them down so the fans don’t go to 100% or else the hot end was cooled beyond the printer’s heating capability. They are mid tier on noise, not exactly quiet but definitely quieter than the stock fans they replaced. And since they aren’t running at 100% they stay lower in volume than basically any fan running full tilt. Would order again.

Bought these to keep routers and power adapters cool and they work really well and run practically silent while providing good air flow. These run 24/7 in an attic with very little ventilation and airflow. The fans are both USB ends, come with fan grills/guards, and a USB splitter to power both fans from a single plug. The speed can even be powered to lo/medium/high. Really great value for what you're getting. My only drawback was that it was missing a screw bolt (only 7 of 8 were in the box) to complete the grill attachments for the second fan. No big deal and still serviceable. Would purchase again.

Works great but I dislike the guards. Functionality wise no issues

Little noisy, but has been working for past week or so. Has been ON for 8 to 10 hours at a stretch on the 3d printer. Fan has started making horrible noise and struggles to turn until I let it spin for a little bit in slow speed

Will be using in a meat curing chamber for air circulation. Small profile is great for maximizing useful area in the chamber.

Great quality last longer

fan after week of working start to be noisy i do not recomend

Decent airflow from USB connection and quiet. Max speed is barely audible, lower speeds are basically silent. Includes guards for front and back and screws with nuts. Doesn't include standard short PC screws, but they do fit if you have extras. The wire protection ends right there it's most important where it connects to the fan so -1 star. 3D printed a mount to attach to electronics.

I built a very humid terrarium and needed a light added airflow but needed something compact, able to be speed controlled and sleek enough so I don’t see them. These work perfectly added both to the top back corners drawing air in and blowing down and out the front. The noise isn’t horrible, just note these are fans and have motors that spin which makes noise but are quite enough you can talk or sleep in the same room. I have a waterfall in the enclosure and can barely hear the fans

Exactement ce qu'il me fallait pour remplacer deux ventilateurs de très mauvaise qualité, dans un 'gadget' pour refroidir sous le Dock de ma switch 2, très efficace et plus fiable maintenant tout reste froid, et a faible bruit :-) Et le 'gadget' avec LED... est devenue un outil fonctionnel, comme il ce doit d'être non brancher au Dock, mais sur prise USB multiprise que du bon.

I used this fan outdoors in a dry, sheltered location. The seller shows the fan mounted on a dirt bike style of helmet, so I assumed this would be fine. After only 2 weeks, the fan was making terrible noise and running very erratically.