This cooling kit for the Raspberry Pi 4 is an affordable and effective way to keep your Pi 4 temperatures in check.
The kit includes a large self-adhesive CPU heatsink with included optional 5V fan and self-adhesive heatsinks for the RAM and USB controller + a bonus additional CPU heatsink (great as a spare or to use on another Pi!).
The kit can be used with or without the included 5V fan. If you want to boost your cooling performance, simply use the included screws to mount the fan in place, then attach the red wire to a 5V pin on your Pi's GPIO, and the black wire to a GND pin.
Note: Large heatsink sits slightly offset of the CPU - see images for placement. Apply gentle pressure for 30-60 seconds when fitting.