Features: The aluminum alloy metal case provides firm protection of the for Raspberry Pi and has a long service life.. There are a number of holes in the lid to provide maximum heat dissipation and help extend the life of the for Raspberry Pi. USB, Ethernet port, audio, micro HDMI and power connectors are accessible and easy to install. Can be equipped with a fan to make heat dissipation more effective. Applicable to for Raspberry Pi 4.Perfect fitment. Specification: Item Type:Protective Enclosure Size: Approx. 9.5 x 6 x 3cm / 3.74 x 2.36 x 1.18in Color:Black/Silver(Optional) Material:Aluminum Alloy Set Type:With Fan/Without Fan(Optional) Package List: Set 1: 4 x Aluminum Alloy Shell 9 x Short Screws Set 2: 4 x Aluminum Alloy Shell 9 x Short Screws 1 x Fan 4 x Long Screw and Nuts Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1、The aluminum alloy metal case provides firm protection of the for Raspberry Pi and has a long service life.. 2、There are a number of holes in the lid to provide maximum heat dissipation and help extend the life of the for Raspberry Pi. 3、USB, Ethernet port, audio, micro HDMI and power connectors are accessible and easy to install. 4、Can be equipped with a fan to make heat dissipation more effective. 5、Applicable to for Raspberry Pi 4.Perfect fitment.