Features: Brand new and high quality This Compute Stick is an expansion board base based for RPi CM4. Provide various expansion interfaces for CM4 module, including upgraded interfaces, GPIO expansion, USB, fan and so on. The size of the expansion base plate is small and light, which can adapt to more usage scenarios. USB-A and USB-AF/USB interfaces cannot be used at the same time. USB-AF and USB-C supply interfaces can be used at the same time. Whether you're working on robotic, or other innovative projects, this board provides the necessary interfaces to bring your ideas to life. Specifications: Material:Plastic Package Includes: 1x CM4 Stick Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.