Description:Add up to 4 peripherals quickly and easily with the Sabrent HB-UMLS USB 2.0 Hub. Especially great for notebooks which come with only a few ports in an era when you need to attach many USB devices at once, such as a printer, card reader, cell phone, iPod, thumb drive, mouse, keyboard, or an external hard drive. Achieve full 480 Mbps on each port, or daisy chain multiple hubs to a maximum of 127 devices. Fully backwards compatible with the USB 1.1 productsFeatures:Blue LED to indicate power status for each port Data transfer speeds up to 480 Mbps Four downstream ports support high-speed (480Mbps), full-speed (12Mbps), and low-speed (1.5Mbps) Supports up to 127 devices by daisy-chaining multiple hubs Some power-intense USB devices may require a AC-Powered USB hubSystem requirements:Windows XP, Windows Vista, Windows 7, Windows 8 Mac OS X or aboveWhat"s in the box?:4-port USB 2.0 hub