Verilux® Raspberry Pi 4 Case, Raspberry Pi 4 Passive Aluminum Alloy Case with Heat Sinks for Raspberry Pi 4 with 3510 Cooling Fan and 4 pcs Aluminum Heat Sinks for Raspberry Pi 4 Model B/Pi 4B/Pi 4

It is a very cool and sturdy design and is the best thing you can buy for your raspberry piit's fan and heat sinks are very effective.. but they should include a manual on how to plug in the fan(when the usb port is facing the front its the first and the 2nd pin from the right top)

Total 8 screw, 4 bottom, 4 fan , but received only 4 bottom screw

Once we connect the Pi to the baseThe Pi display will not work, Even though I have purchased 2 numbers of CaseBoth results are the same, Either powerfully will become a loose connection and Display will come and goNote: once we remove the case and connect directly to the Pi everything worked fineAs a summary: Please don't buy the case by both the case is useless I am returning them