AFENDO® Portable 4 Port USB Hub 3.0 High Speed Hub / Plug and Play Notebook and tablet MacBook Air, Mac mini, Mac OS X compatible win 7/8 - 18 months warranty - Silver (Personal Computers)
Used on a Macbook Air 11 inches, the hub tends to disconnect constantly, even with a USB key and a keyboard connected to it (thus consume very little energy). Stay away.
