DFRobot FIT0775 Rack Tower for Raspberry Pi 4B/3B and Jetson Nano is a 4-layer acrylic oversized fan enclosure that provides shell protection and cooling solutions to various products. This includes Raspberry Pi clusters, Raspberry Pi NAS servers, Jetson Nanoclusters, and disk array clusters. The rack tower is very delicate and features long fixing screws that are designed with flat head screws. These screws are smooth and easy to install. The fool-proof design of the positioning holes can prevent users from having trouble during installation. The rack tower rack features a variety of screws with different specifications that can meet various product fixing needs. This tower rack features a cooling fan that operates at 5V and can be directly powered by the Raspberry Pi that will have a colorful halo when it is running.