Features: The CM4 Mini IO expansion board is the perfect solution for expanding for RaspberryPi capabilities! Made with durable plastic and metal materials, this expansion board is built to last. For technology enthusiasts, makers, and developers to fast and easy to build a mini-computer. Use it to connect additional peripherals, sensors, or displays to your RaspberryPi, or even create custom project and prototypes. With easy plugandplay,installation and compatibility with popular operating system like Raspbian, this expansion board is a must for any serious RaspberryPi user. Specifications: Item:CM4 Mini IO Expansion Board Material :Plastic and Metal Size:as Pictures Package ：CM4 Mini IO Expansion Board/ CM4 Mini IO Expansion Board with Enclosure Package Includes: 1PC CM4 Mini IO Expansion Board note: Due to the different monitorand light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring error due to manual measurement