KEDSUM&reg; USB 3.0 4-Port Compact Hub with a Built-in 0.85 ft USB 3.0 Cable USB 3.0 Transmission speed is very fast ,The heigest 5 GPBS,USB 2.0 compatiable . 0.7inch space between each USB hole,dont have to worry about the equipment on crowed or not. Plug and play, no driver required, SupportOS.WindowsXP/Vista/7/8/8.1/Windows 2000.ME/Linux/Mac 10.0 or Above. Bulit-in over voltage,Over current module can effectively protect all connected devices and the HUB security and stability . Blue LED lamps,working status is clearly visible.Compact size and portable, ideal for laptop, ultrabook and tablet PC.