Review on High-Performance Raspberry Pi 4 Fan - Quiet DC Brushless CPU Cooling Fan with LED - Ideal for Raspberry Pi 4 Model B and 3B+ 3B 2B+ by Jay Maryland

I bought a fan for my Raspberry Pi microcomputer because I sometimes got a high temperature warning. The fan blows enough air to prevent the high temperature warning. Easy to connect to Raspberry power pins for power supply. There is a noticeable level of noise from the fan, but I have to try to hear the fan and my ear has to be within 3 feet of the fan in a quiet room to hear it. Otherwise, the only sign that reminds me the fan is running is the blue light built into the fan. This is a bonus. The mounting screws provided were not compatible with my Raspberry Pi box, but for the first two weeks I mounted the fan directly onto the CPU heatsink and had no problems. I made a more secure mount using double sided tape and a non-conductive pad. Good value for money.