Delinx8W DC 12V PC Cooling Fan Speed Control,USB to Dual 3-Pin 4-Pin Fan Power Adapter Cable,DC 5V Step up 5-12V Adjustable,with 2-Way Splitter Cable

This is a great little product for DIY-ers, I bought this so I could make a personal cooling fan made of Noctua fans :DThe fans spin all night with no issues whatsoever. Its a decent product for a decent price. Just make sure you check the wattage that your fans need, so youre not overloading this, it was clearly designed for 2 average computer case fans.

Wanted a quick, simple way to get some leftover 120mm PC fans running exhaust on a 3D printing enclosure and this did the trick. A little chunky and cheap feeling but that didn't matter for my use case.

Had a couple of 120mm case fans lying around and wanted to add a bit more cooling to my laptop stand since I work from home, and sometimes I really push my work laptop to the limit. The stand's tray already comes with holes, so I figured why not attach some fans underneath and add extra cooling. This adapter works perfectly for the situation. I get to control the speeds of the fans, and now my laptop doesn't get as hot, plus since I already had the fans, it was a fairly cheap solution.

Been working on a project for a new homemade office desk. Using this to control two 120mm fans for the PC enclosure cooling. Really like that this uses a USB port to drive PC fans "EXTERNALLY" from the case. Helps to evacuate any residual heat, so I can keep the PC below the desk in a small enclosure but not worry about overheating. I like the speed adjust feature, but honestly, I run my fans on 100% using two 'whisper quiet' ~20dB and can barely hear them. Good product, and good price for what it does.

Works great. Used it to turn an old noctua fan into a desk fan. Stepless control is nice, but it will make slight electrical noise depending on the speed.

Got this to use for short periods when testing 40mm server fans. It works well for those, but some smaller or larger fans exhibit weird behavior.

Works great. Note that the speed control seems to work on FLX fans as well.

I tried multiple different fans (3-pin and 2-pin) but none turned on when connected to this device. The lights power on on this adapter when you power it on but it doesn't power the fans. It seems easy to use if it would work and maybe it's just the quality of the one I had.