YunSen Portable Wired USB ABS Aluminum Alloy Foldable Keyboard For Apple Mac Windows Android os ABS + Aluminum alloy. USB Port. Plug and play. The key cap is used "X" structure design. quieter and more comfortable. Highly folded, breaking the traditional shape of the keyboard. With excellent portability, and durable. Compatible: Win98 / me / 2000 / xp / vista / win7 / Win8 / Apple Mac os Smart phone / Tablet PC etc, all other Android 2.3.3 3.0 4.0 (and above) devices with USB