Quickly expand 4 x USB 3.0 ports convenient to connect USB 3.0 and traditional USB devices; In actual test it supports mobile HDD large power consumption devices; Integrated battery charge controller circuit can achieve USB Battery Charging 1.2 specification requires a dedicated charging port (DCP) charging downstream port (CDP); Support connecting mobile hard disk / USB flash drive / card reader / mouse / keyboard / mobile phone / tablet PC / MP3/MP4 / voice recorder and other USB devices; Can connect four USB devices to the desktop / notebook / ultrabook / tablet computer use or charging. Features: Simple appearance high strength ABS material lightweight and durable; Each USB port with independent button switch; High speed transmission with USB 3.0 standard; Supports 4 devices operating at the same time; Safe and reliable; With the protection of over-voltage over-current effectively protect hub and the device connected; Plug and play supports hot swapping; OS supported: Widows XP / 2003 / Vista / 7 / 2008 / 8 & Mac; Low power consumption and no noise with stable working performance.