1,This aluminum alloy box is used for Raspberry Pi 4B module, which protects the internal module and has good heat dissipation effect. 2,The high-quality CNC aluminum alloy casing can protect your Pi safety, radiation protection, and not easy to rust. 3,The open design can make sure that our CNC case will not affect Wifi and for Bluetooth signals. 4,This product is equipped with dual cooling fans, which can quickly dissipate heat. 5,Small size, easy to carry and store, convenient to use and with good performance. 1 x Shell1 x Bottom Shell1 x User Manual1 x Screw Pack3 x Thermal Tape Item Type: Aluminum Alloy Case Material: CNC aluminum alloySuitable for Raspberry Pi 4B caseCompatible for Raspberry pi2B or 3B or 3Band 4B Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.