2 Pack Dual 4 Pin to USB Fan Switch ON Off Power Adapter Cable 1 to 2 Ways Splitter USB to 4PIN 3PIN PWM 5v Fan Connector

I have a large number if external hard drives, many of which are in exposed multi-drive bays. some of these drive in the 8tb &12tb sizes tend to get hot during extended uses when monitoring with CrystalDiskInfo.these cables make it so that I can run 120mm fans on the side of the bays and reduce temps to well within safe operating range.I use three double-bay and a four-bay device.

If you have an older AVR with a USB plug, these are great for adding a couple silent pressure fans to keep the heat down.

The media could not be loaded. Can only supply enough power to wiggle the fans let alone spin them. And its not my old case fans. I have another similar case fan usb adapters and it's able to power these 140mm fans no problem; they simply don't have the on and off switches.It's clear that these cheap ones are poorly build. Even with a little push, the case fans loses most of its spin within a few seconds