1、Ultra thin design,easy to install,quick heat dissipation. 2、Smooth straight aluminum material and double fan design for better heat dissipation performance. 3、Open design, no effect to WIFI signal,more stable wireless transmission. 4、All port and slots in the case are perfectly fit for Raspberry Pi 4 Model B / B +. 5、Reinforced aluminum, lightweight, durable and reliable. Features: Ultra thin design,easy to install,quick heat dissipation. Smooth straight aluminum material and double fan design for better heat dissipation performance. All port and slots in the case are perfectly fit for Raspberry Pi 4 Model B / B +. Open design, no effect to WIFI signal,more stable wireless transmission. Reinforced aluminum, lightweight, durable and reliable. Specification: Item Type:Case Material:Aluminum Alloy Size:Standard Size Color:Black Fitment :Fit for Raspberry Pi 4 Model B / B + Package List: 2 x Black Case 2 x Fan 1 x Wrench 12 x Screw 3 x Glue Paste