Review on 🔧 GeeekPi 4pcs Raspberry Pi 4 Quiet Fan - Efficient Cooling Solution for Raspberry Pi 4 Model B and Earlier Versions - DC 5V 3.3V Brushless CPU Cooling Fan Cooler Radiator (Black) by Dave Hunt

I think it was a great offer! The 2 was $10 at the time of purchase and the 4 was $13, so I figured I'd grab the 4 just in case I get a different Pi later. The 3V fan is virtually silent while the 5V fan is somewhat audible, but even then it's fairly quiet. I keep mine at 5v as my Pi is overclocked and it stays pretty cool. I also love the lights which is one of the main reasons I bought them and they add a nice touch to the Pi, especially if you have a transparent case. I would recommend them as 4 packs have the best price.