The U360-004-SLIM 4-Port Ultra-Slim Portable USB 3.0 SuperSpeed Hub's built-in USB cable connects to your laptop, Ultrabook™ or computer to expand the number of available USB 3.0 ports. Just plug and play with no drivers, software or external power supply needed. The bus-powered hub distributes necessary power to its four USB 3.0 ports through USB connection. When using a separate cable between the hub's USB Micro-B port and your device's USB port or a USB charger to draw additional power, the hub can provide up to 1.5A for fast charging of mobile devices.The ultra-slim case measures 4.2 x 1.3 x 0.4 inches to fit easily into your pocket, backpack, briefcase or laptop bag to connect USB-enabled devices wherever you are. It supports USB 3.0 data transfer rates up to 5 Gbps-ten times faster than USB 2.0-and is backward compatible with USB 2.0 and USB 1.1 devices. All four ports support USB Battery Charging (BC) specification v1.2. The U360-004-SLIM is compatible with all Windows® and Mac® operating systems.