USB Annex 4-port High-speed USB 2.0 Hub expands your single USB port into 4 ports, allowing you to connect multiple USB devices to your computer at the same time. This include devices such as mouse, keyboard, external hard drive, memory card reader, webcam, USB flash drive, digital camera, printer, scanner, external CD/DVD drive, and more. USB Annex supports high-speed transfer rate of up to 480 Mbps with USB 2.0, and is backward compatible with USB 1.1. The unit protects your computer with automatic overcurrent detection for each port. USB Annex is truly plug-and-play, and works on Windows 98SE, 2000, Me, XP, Vista or Mac OS 8.6 and later. Powered via USB, USB Annex requires no external power when connecting most devices. In the case where you need to connect devices that require higher power, a power adapter is included in your package for your convenience. This Ultra-Portable Model comes with a built-in USB connector, making it perfect for laptop application. Its rubber coating, mirror finish, and attractive blue LED power indicator make USB Annex the most stylish USB hub in the market.