4 Pack USB Brushless Cooling Fan 40mm High Performance DC 5V Speed 4200 RPM for Small Appliances Series Replacement For Desktop

I use these for little hobby items and they are a good fit. nice quality so far and I love the USB connector which makes it easy to plug in anywhere you have an outlet with a USB plug or directly into the nearest computer, etc. These are small so don't expect large airflow but they work well for their size, as expected.

These are extremely loud for the teeny tiny fans that they are but they’ve worked great for the past ur I’ve had them. I use them in my IKEA mini greenhouses and they do the job providing air flow for my plants props.

All I needed were small fans that ran off of USB in order to add a cooling option to the inside of a costume. These were exactly what I was looking for, so I'm happy. They have a very quiet buzz that only really affects me because the fans will be close my face, but it's not too bad of a sound so I'm not really bothered. They also aren't very powerful, but I wasn't expecting much out of a tiny 5V fan, and it works well enough at close range. I also noticed some other reviews saying that there were some exposed wires on the units, but it seems they are a bit more contained on the ones I got so I am not too worried about that. Overall, pretty satisfied.

A great little fan for keeping your systems cool and not overheating. Just plugs into a USB port on your system, and it powers up when the system turns on (I'm using on a PS3). Slight noise from such a small thing, but it's nothing too overly annoying. Definitely a worth buy.

im using this little fan for a desktop green house, It does wonderfully to circulate air. i wasnt sure if the moisture or humidity would be a problem but havent come across anything yet. while I have a very limited idea of what this is original for but i dont think its this lmfao. it does make a noticeable amount of noise if i dont have my headphones on its not annoying or high-pitched.

NOT TO HE USED FOR FURRY HEADS ———————— 5 stars bc it does what it does BUT it for NOT the use in fur suits. It was a power supply that must be constantly connected to a usb port. There is no battery in this product, so it can’t be used independently without being hooked up to its power supply . But I give it 5 stars for being a great product

I wired these fans in a series to circulate air around an an iPad in a hot aircraft. One sucking and one blowing. Worked well. The price for four of them in one bag is amazing.

These 40mm USB brushless cooling fans work initially and move a decent amount of air for their size. They’re easy to power via USB and fine for light-duty use at the beginning. Unfortunately, durability is a major issue. Out of the four fans, three failed within about 90 days or less. That makes them unreliable for any setup where long-term operation matters. For the price, you do get basic functionality, but lifespan is disappointing. Overall, okay for short-term or temporary projects, but I would not rely on them for continuous use.