Description of  USB Interface USB Hub 2.0:1.Use USB 2.0 USB Hub Controller2.Connected to computer directly, Plug and Play, support hot plug3.Cord Length: 11CM 4.4 USB Ports, Power Supply of each USB Port could be 500mA Max5.Built-in current overload short-circuit protection6.Support 127 PCS USB Devices Max7.Supporting System:  Win95/98/Me/2000/XP/Win7/Win8/Win10,Linux2.4 and macOS8.5 and above  version8.Output  interface: Four-port USB 2.0 HUB, backward compatible with USB1.0 / 1.1/2.0 ,transferSpeed is 1.5/12/480Mbps