Aiyide 2 Pack USB to 3-Pin / 4-Pin PWM 5V Sleeved Fan Power Adapter Cable, Case Fan Connector (USB-3Pin/4Pin)

This USB to 3/4 pin connector works, but just be aware you will have no PWN control over the fans and they will be set to their lowest RPM setting, which can be a downside for some. But as long as you're aware of that, they work exactly as intended.

2/3 pin connectors. Completely unusable

These make for a fantastic addition to your collection of adapters. Especially if you like to come up with your own tricks to solving problems. Have an external drive dock that gets a little hot during a clone? Slap a random fan next to it and use one of these to power it up. We do it all the time for this since most docks don't have built-in fans to help compensate for such heat. We just reviewed an external fan for an Xbox that is pretty great, but you could also throw a normal (internal) PC fan on top of the console and use one of these to power it up with. As long as you choose a fan that is whisper-quiet, you'll forget that it is even on. There are so many uses for these, and a lot of them involve random projects that could benefit from a little air. Or, you can simply sit a fan on your desk, point it at your face, and plug it in for some instant cooling during the summer. Let your mind have fun. **If you have found our review helpful, please vote it as helpful below so we know. This helps us to provide quality feedback in the future.

So yeah the listing flat out lies about this usb being able to support a 4 pin fan, do not buy this product.

Works good but I though it would have 3 or 4 pins rather than 2