Features: The X873 is a USB 3.0 to NVMe Solid Disk expansion board specifically for RPi 4, providing easy and fast way to expand the storage capacity. A variety of M.2 Solid Disk size can connection (including 2280, 2260, 2242 and 2230). The Fast Speed USB 3.0 port enables fast data transfer speeds of up to 5Gbps, allowing you to move large amounts of data very quick. In addition, LEDs indicating read or write status support booting the operating system from the Solid Disk for faster launching of applications,and file copying. Support for booting operating systems from Solid Disk, faster application opening; The X873 also includes a power button for easy control of power, important feature missing from the for rpi 4. One button turns it on, pressing the switching for 3seconds initiates a safe shutdown, and pressing the switching for 7seconds forces a shutdown. Specifications: Model：X873 Expansion Board Size:about 87.3mmx72mm/3.44x2.83in Supports M.2 NVMe Solid disks up to 4TB; Supports 2280, 2260, 2242 and 2230, M.2 NVMe Solid disks Integrated USB3.1 Gen1 5Gb/s connection Ensures adequate power supply through GP10 pin header and USB port. Package Includes: 1Set X873 Expansion Board note: Please allow 0-1cm error due to manual measurement. please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color!