CRJ Full Speed 12V Voltage Step-Up USB to 3-Pin and 4-Pin PC Fan Sleeved Power Adapter Cable

This is probably just a cable with a micro buck boost installed in the cable housing, but its perfect for testing fans and/or using it to power up a spare fan for a desktop cooling device. Only thing Id knock is the price.

Duha , fans appear to be spinning at full speed

Ordered a 5v cord first time.. This works great for the higher RPM computer fans-- in ANY type of build. ANYTHING you could need one for.

When it works it works great, it steps the voltage up to properly use a 12V .25A static pressure fan and I appreciate that. Unfortunately its making extremely bad contact and only works with someting putting pressure on the leads. Annoying.

This was exactly what i needed to repurpose an old tower desktop fan. The fan was still great, it just needed that bridge from 3-pin to USB. That being said, as everyone mentioned, this is just a two pin setup. But the fans ran as soon as I hooked them up and plugged them in to a USB outlet or a plugin adapter. This will run the fans at full speed and you will get a fair amount of breeze. Perfect for how i wanted to use this to cool additional electronics.

This is exactly what I wanted and exactly what I expected. Im using this to power a case fan that I no longer need and use for other purposes.

couldnt use did not receive working item

Does what its advertised to do, tested on PS3. Was purchased to power up a 140mm PWM fan that is going to move air towards exposed SSD heatsink on PS5. Fan started without any issues when used PS3 USB ports, so far so good. No build quality issues observed on delivery. Will later test if it works with laptop ports. Also performed well in combo with a fan speed controller attached in chain towards the fan. Product recommended.

Ive pugged this into several different charging blocks. Works great, awesome for testing fan motors. I bought it to use in a soldering vent setup, keep using it to test computer fans.

I needed a 120mm fan for my Intel NUC. I 3D printed a custom case and all, but needed a way to power the fan. This works perfectly!