compatible hardware following: 
For Arduino Uno 328 
For Arduino Diecimila / Duemilanove 328 
For Arduino Mega 2560 (recommended) 
For Arduino Mega 1280 
Support Google Android ADK, support Android phones: G1, Nexus One, Nexus S, Motorola Droid X 
(Phone system needs to be upgraded to Android 2.3.4, tablet PCs need to upgrade to Android 3.1) 
Let Board achieve USB HOST function, can communicate with other USB devices and support USB HUB function.