USB 3.0 hub with 3x USB 3.0 ports, data transfer rate of up to 5 Gbps. Integrated SD and MicroSD card reader, compatible with SD-HC, SD-XC, MicroSD-HC and MicroSD-XC. Self-powered: just connect it to a USB port, it does not require additional power sources. Compact: ideal for taking it anywhere with your laptop, it takes up very little space on your desk. Dimensions: 3.5 x 0.8 x 0.8 in