FeaturesComprehensive Protection — Raspberry Pi 4 armor aluminum alloy metal case specially designed for the Raspberry Pi 4 Computer Model b the surface is easy to produce a dense and firm protective film to protect the substrate from corrosion it is light and durable strong wear resistant and difficult to embroider.Effective Heat Dissipation — Open case design with aluminum alloy metal material it has passive heat dissipation due to without fan. the housing can be equipped with a cooling fan and built-in thermal column making heat dissipation more effective.Superior Signal Transmission — Open case construction and slotted aluminum alloy case does not affect the WIFI BT signal transmission. More efficient work.Anti-Fall — Like previous releases the aluminum shell carved by CNC not only can offer well heat dissipation but also can give you extra protection of Raspberry Pi. It wraps around Raspberry Pi 4B like exoskeleton protecting your Pi from accidental falls.Premium Material — Made of aluminum alloy material with the oxidized sandblasting process the case is smooth and nonconvex. Features high hardness pressure resistance and strong metallic luster for not easy to rust. The aluminum alloy material is more conducive to heat dissipation.