Features: brand new and high quality X825 Expansion Board It is updated from the 3B+/3B X820 V3.0 2.5" Sata SSD expansion board, provides a storage solution for the latest 4B, (if you want to use the 3b+/ 2.5-inch SataSSD is used on 3b/2b, please refer to X820 motherboard) It supports 2.5-inch Sata interface hard disk (HDD)/solid-state drive (SSD) up to 4TB; The x825 allows booting the OS from the HDD/SSD for faster application opening, web services and file copying, a microSD card is required to force Raspbian OS to use the HDD/SSD for its "root" partition. for: All operating systems Power the through the Pi's 40-pin header, no additional power is required for the 4BUSB 3.1 connector to Sata 6Gb/s bridge controller Specifications: Item: X825 Expansion Board Memory: 4TB Power supply: AC 100 - 240V input 50/60Hz, 5V for DC 4A output for DC power plug size: approx 5.5x2.5mm Card Size: approx 10.5X8.5CM/4.13x3.35in LED Red light indicates: power Status Blue light indicates: Srive Status Package Includes: 1 Set x X825 Expansion Board note: Please use a high-quality for DC 5V 4A power supply, If you use a poor quality power supply, you may damage the X825 motherboard and 2.5" HDD/SSD. After powering the X825 expansion board, you no longer need to power the motherboard! Please do not power the through the 40 pin header and the micro USB at the same for time. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!