Features: brand new and high quality Argon ONE M.2 Expansion Board extends support for M.2 SATA or NVME SSDs to maximize the true potential speeds of your RaspberryPi 4. You will now be able to boot via an M.2 SATA or NVME SSD for faster boot-time and larger storage capacity compared to the traditional microSD Card. To use it, simply replace the bottom of the Argon ONE Cases with the expansion board, and the cases can now use SSDs. It is recommended to use RaspberryPi 4 Cases though due to the USB3.0 ports the boards provide. Argon ONE M.2 is UASP Supported for the RaspberryPi 4 which means you can maximize the transfer speeds of your M.2 SATA or NVME Drive. It is compatible with most M.2 SATA or NVME SSD with Key-B and KeyB&M. Specifications: Material: Metal Type: SATA/NVMe Size:Approx. 13x10x2cm/5.12x3.93x0.78 inches 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. Package includes: 1 Set Expansion Board