characteristic: Each USB port LED is designed to check the working state of the USB device USB2.0 interface supports hot plug and play; Easy to use and carry Support overvoltage and instantaneous current protection functions, effectively protect connecting equipment and HUB itself It conforms to USB 2.0 specification, supports high-speed 480bps bandwidth transmission, and is downward compatible with USB1.1, USB support Windows XP/Driverless support Vista/7/8 and MAC explain: Product name: Aluminum 4 USB2.0HUB Weight: 55G Length: 90CM Product size: 88 * 39 * 22mm The hub is applicable to USB devices such as mobile hard disk, U disk, card reader, mobile phone, digital camera, high-definition camera, digital camera and multi-channel audio. Support simultaneous connection of multiple USB3.0 high-speed devices for transmission. Supported systems: Windows 95/98/2000/2003/ME/XP/Vista or Mac OS 8.1 or higher (Windows 95/98 system installation driver) Package includes: 1x4 port USB 2.0 HUB