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>