hootoo *hot sale* bus-powered portable usb 3.0 hub 4-port compact hub [backward compatible with usb 2.0] for windows / mac / linux os / tablets / laptop  this hootoo? bus-powered usb 3.0 4 port compact hub is a portable and compact usb extension that allows you to retain superspeed access to your devices. keep your desk top neat and tidy! <br><br> instant expansion:<br>plug-and-play device with no drivers or power adapter required. 4 usb 3.0 superspeed ports supply you with transfer rates of up to 5gbps.<br><br> compact design:<br>compact and portable size is fit for travel and keep your desk top neat and clean. draw power directly from computer. no additional power adapter needed. <br><br> special port design:<br>horizontal ports design avoids external devices crammed and makes full use of each port.<br><br> system requirements:<br>windows xp / vista / 7 / 8, mac os 9.1 and above<br>mac os x lion 10.7.4 users should upgrade to mountain lion 10.8.2 or later to avoid unstable connections. <br>2012 june macbook air and macbook pro users can download "macbook air and macbook pro update 2.0" from the official apple website as improvement of usb 3.0 performance and compatibility.<br>2012 mac mini and 2012 macbook pro with retina display are currently not recommended for use with this product because the unstable performance<br><br> additional notes:<br>- some usb 3.0 devices require direct connection to host ports.<br>- to ensure a stable connection, don't use this hub with high power consumption devices (those exceeding a combined current of 0.9 amps among all ports) such as some large-capacity hard drives.<br>- 2.4ghz wireless devices such as wireless keyboard and mouse adapters may not work around usb 3.0 ports. try using a usb 2.0 connection.<br>