1. The X825 expansion board provides a complete solution for the latest for 4 B 8GB/4GB/2GB, it supports 2.5-inch SATA Hard Disk Drive (HDD)/Solid State Drive (SSD). X825 card only has 2.5-inch SATA HDD/ HDD interface; 2. Supports up to 4tb 2.5inch sata hard disk drive (hdd)/solid state drive (ssd) (theoretically it can also be used with 6tb or 8tb. But in practice we 't test x825 cards 6tb or 8tb hard drives, you can have one try.) 3. perfect solution for 4 B 4. for via Pi's 40-pin header 5. The red indicator LED indicates the -on status, and the blue indicator indicates the device status 6. USB 3.1 Gen1 to SATA 6Gb/s Bridge Controller 7. Fast file transfer via high-speed USB 3.1 connection from PC or 8. for - RPI 4 requires no additional Product Name: Hard Disk Expansion Board : X825 V2.0 Interface: USB3.0, DC , 2.5-inch hard disk interface, 5V PWR output Applicable products: Suitable for 4B with NAS hard drive supply: AC100-240V input 50/60HZ, 5V DC 4A output Product size: 107.2x85mm Colour:black Material:PCB+Metal Package Contents: 1 x X825 V2.0 expansion board 1 x screw pack Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.