4-port SuperSpeed hub features an ultra-slim, portable design that easily fits into your pocket, backpack, briefcase or bag to keep this device with you wherever you are. 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 this hub 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. Hub supports USB 3.0 data-transfer rates up to 5 Gbps and is backward-compatible with USB 2.0 and USB 1.1 devices. All four ports support USB battery charging specification v1.2. SuperSpeed hub is compatible with all Windows and Mac operating systems.