Review on 🔌 ELUTENG 120mm USB Powered Fan with 3-Speeds, 1500PRM, Portable Cooling for Gaming PC, Tablet, TV Receiver, Router, DVR, PlayStation, Xbox, Computer and More by Dustin Barry

This variable speed fan with a High, M, Low on/off switch on the cable is what I need needed. My NAS has two mSATA cards that attach to the back of the motherboard where there is no airflow inside the case and they get very hot. So I cut a round hole in the metal cover, attached a 4.5" speaker grill to the hole, and attached this slim fan directly to the speaker grill with small screws and rubber O-rings (see image). mSATA drives remain in good condition. and cool, and this fan is not at all audible on low settings. In fact, I can't hear it at altitude when the case fans are running. PERFECT for my needs.