Tripp Lite's 4-Port Portable USB 3.0 SuperSpeed Ultra-Slim 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 4 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 1.5 Amps for fast charging of mobile devices. The ultra-slim case measures 4.2 in. x 1.3 in. x 0.4 in. 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-10x faster than USB 2.0-and is backward compatible with USB 2.0 and USB 1.1 devices. All 4 ports support USB Battery Charging (BC) specification v1.2. The U360-004-SLIM is compatible with all Windows and Mac operating systems.