Fuhjythy Fan HAT for 4/3 Cooling Fan with Software Adjustable Speed / 40mm Big Fan for Raspberry Pi4

Use it on any case that offers hat support, such as POLY + or NEO. The best part is that it work for the 4 Model B, 3 Model B, and 3 B +. With just one line of writing, you have the full functionality of the hat, allowing you to do additional features like restarting the pi and adjusting the fan speed of the single board computer. You can even program when the fan adjusts its speed, giving you full control of the hat. The cap is a simple cap that cools the Pi and gives it a safe shutdown button. You can change the fan speed according to the CPU temperature. Provides enough space to use heat sink on board chips.