SABRENT 4-Port High Speed USB 2.0 Hub Top-Loading USB Port For Quick And Easy Access Allows Addition Of Up To 4 Additional USB Devices Well Spaced Ports To Avoid Crowding Compatible With All Operating Systems Incl. Windows XP/Vista/7 And Mac OS X This SABRENT USB Hub provides Plug-and-Play simplicity for all of your USB peripherals such as USB Flash Memory Drives, USB Card Readers, iPod Docks, Printers, Cameras, Scanners and many other everyday USB peripherals (NO PERIPHERALS INCLUDED WITH THIS HUB) Convenient Port Layout The top-loading port provides vertical access which is great for your more portable devices such as USB flash drives. This hub spaces out the 4 ports so that everything fits nicely and easily unlike inline hubs where ports can be crowded. This Hub will provide up to 450mA to each USB port eliminating the need for a power supply for most USB peripherals. While most USB devices do not require additional power, some power hungry devices like external hard drives that do not have their own on board power will require a external power supply. (Not included) Compatibility Backwards compatible with USB 1.0 devices and is compatible with all computers that have a USB 1.0 or 2.0 port Compatible with all Operating Systems including Windows XP/Vista/7 and Mac OS X