1. The X825 expansion board provides a complete storage solution for the latest for 4 Model 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 don't test x825 cards that use 6tb or 8tb hard drives, you can have one try.) 3. perfect storage solution for 4 Model B 4. Power for via Pi's 40-pin header 5. The red indicator LED indicates the power-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. Power for - RPI 4 requires no additional power Product Name: Hard Disk Expansion Board Model: X825 V2.0 Interface: USB3.0, DC power jack, 2.5-inch hard disk interface, 5V PWR output Applicable products: Suitable for 4B with NAS storage hard drive Power 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 storage expansion board 1 x screw pack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.