Features: 1.Aluminum alloy metal shell is strong to protect for Raspberry Pi, and has long service life. 2.There are many holes in the cover to provide the best heat dissipation and help extend the life of the for Raspberry Pi. 3.The USB, Ethernet port, audio, micro high difinition multimedia interface and power port access are easy to install. 4.The heat is transferred to the heat conduction column to dissipate heat to the whole shell. 5.The product is featured with high quality, durable appearance and stable performance. specification:Item Type: Passive cooling shell Special Service: Passive cooling The heat is transferred to the heat conduction column to dissipate heat to the whole shell. Shell Size: Approx. 90 x 65 x 23mm / 3.5 x 2.6 x 0.9in For Raspberry Pi 4 PackageList:1 xPassive Cooling Shell1 x Wrench2 x Long Screw2 x Short Screw3 x Patch