Add up to 4 peripherals quickly and easily with the Sabrent HB-UMLW 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 products Features: White 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 hub System requirements: Windows XP, Windows Vista, Windows 7, Windows 8 Mac OS X or above What"s in the box?: 4-port USB 2.0 hub Warranty: This product comes with a one year warranty. In order for us to properly assist you, please follow these simple instructions: Go to www.sabrent.com/support and click ‘Submit a ticket’. Submit your ticket. You must include your Amazon Order ID# number in the subject line.