Review on ELUTENG 120mm Transparent USB Desk Fan with Blue LED Light 5V Ventilation for Receiver, Router, Laptop, DVR, Playstation, Xbox, Computer Ventilator by Justin Boisvert

I have a pair of Raspberry Pi 4s which run hotter than previous, slower Pis. After some searching I found this nice big fan. I put two Pis on top and taped them together (to protect them from tipping, sliding, etc) and connected the fan to the nearest USB bus. It's backlit with soft blue LEDs, which I didn't really need, but it's handy to see at a glance if it's working. It keeps the temperature of both Pis about 10 degrees cooler; They still operate on the warm side, 33°C/91°F in a 60°F room, but better than they were. I can't say anything about the durability yet, but the fan has been running for a few months without any problems. . It's quiet and just does its job. So far very satisfied.