Review on GeeekPi 4pcs Raspberry Pi Cooling Fan Set - Quiet, Efficient 40x40x10mm 4010 Fans for Raspberry Pi 4 Model B, 3B+/3B/2B - DC 5V 3.3V Brushless CPU Cooler Radiator (Blue) by Lequon Kirkpatrick

OVERVIEW These are good little fans and I would buy them again. They are quieter than the standard fans that come with one of the kits. Not as quiet as SOUND LEVEL. They're pretty quiet, especially for the price. The fans have been running continuously since installation. The sound does not change when the device is tilted (e.g. when moving or looking around). No squeak. You can tell they're visually on with an LED (which looks cool). DURABILITY Time will tell. I'll update the review if anything changes towards the dark side. But I've been using them for over a month and they didn't show any negative sound quality. Staff crackled after two weeks. These are better.