Features: brand new and high quality Suitable for: Type1B + / Type2B / Type3B / Type 3 B+; Applicable to all operating systems. for Ideal storage solution for Pi, dual-medium SATA SSD shield; Support up to 4TB MS ATA solid state drive (SSD). Support 2 MSATA SSDs to work at the same for time; Support operating system installation and booting from SSD Provides additional 2 USB ports for Pi; Power the through the onboard XH2.54 connector-Only one power adapter is required Integrated USB 3.1 Gen1 hub controller to SATA 6Gb/s bridge controller;Fast file transfer via PC or for Mac via high-speed USB3.0 5Gb/s connection; Special USB3.0jumper, can be connected with Pi-no other cables are needed Specifications: Power Supply: 5.1V for DC 4A Port and Connector: for DC Jack 5.5x2.5mm USB Jack: USB 3.0 type A Power input/output connector XH2.54: 2pin Item Size: Approx 107.5x85mm/4.23x3.34in Material: Metal Package Includes: 1 x Expansion Board note: Only for original power supply. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. USB3.1 Gen 1 port, SSD sequential write speed >300MB/s mSATA SSD is not included. As with all SSDs, new media must be formatted before use Performance depends on host system, workload, and SSD media used