4-port high speed usb 2.0 splitter, unpowered usb hub features: 4 port usb hub perfect for connecting usb 1.1 or 2.0 peripherals such as usb mice, usb portable hard drives, usb cd-r/rw or dvd-rom drives and usb 1.1 hubs allows simultaneous operation of up to four separate devices all attached to a single usb port supports win7 ,windows vista, windows xp, 2000, 98, and mac os 8.6 and higher plug and play color: black