Features: Made of high end transparent acrylic shell,elegant and unique. Easily connection to Type?C power port, HDMI port, audio port, Ethernet port, USB 3.0 port, USB 2.0 port. This chassis is equipped with a cooling fan that can be connected to the GIPO pin for operation. The fan increases the airflow inside the chassis, providing a cooler environment for RPi 4B. Since the CPU generates more heat than other chips, the heat sink of the CPU is made of brass, which is better than the aluminum heat sink. Specially added four heat sinks to double cool your beloved for RPi 4B. Specification: Item Type:Shell Material:Acrylic Color:Transparent + Black Size:9.7 x 7 x 2.7cm / 3.82 x 2.76 x 1.06in Package List: 1 x Shell 1 x Fan 4 x Heat Sink 1 x Screwdriver 1、Easily connection to Type?C power port, HDMI port, audio port, Ethernet port, USB 3.0 port, USB 2.0 port. 2、Made of high end transparent acrylic shell,elegant and unique. 3、This chassis is equipped with a cooling fan that can be connected to the GIPO pin for operation. The fan increases the airflow inside the chassis, providing a cooler environment for RPi 4B. 4、Since the CPU generates more heat than other chips, the heat sink of the CPU is made of brass, which is better than the aluminum heat sink. 5、Specially added four heat sinks to double cool your beloved for RPi 4B.