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.