Features: The onboard 40PIN GPIO interface and standard CM4 connector support access to Compute Module 4 Lite/eMMC series motherboards. More rich interfaces, equipped with ETH / MicroSD / USB and other practical interfaces to meet the demands of the exclusive applications in the development of use. Suitable for RaspberryPi with special functional requirements or other industrial occasions. High-quality materials, solid and stable, durable and long life. Fast start-up, loading and file transfer, low power consumption, quiet and reliable. Specifications: Main Material: Metal+Printed Circuit Board Size: Approx. 68x55mm/2.68x2.17 inch CM4 Card Board: for all versions of Compute Module 4 Ethernet: Dual Gigabit Ethernet RJ45 interface USB: USB 2.0 interface Connector: for RaspberryPi 40Pin GPIO interface Storage Onboard: MicroSD card slot (for versions without eMMC) Fan Interface: four wire SH1.0 interface, adjustable speed, speed measurement, 5V Power Input: 5V, Type-C interface Package Includes: 1x CM4 Expansion Board note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.