... to choose: (specially for pico projector)a. board 301: Multimedia I/O: HDMI in, USB2.0, SD card, A/V in, VGA ... board 302: Android 2.1OS with WIFI I/O: VGA, USB2.0 input, AV in, Micro TF slot ... with WIFI I/O: USB2.0, A/V in, VGA, Audio outvideo compatibility: RM/RMVB, MPEG, WMV, AVI ... . board 304: Accessory projector I/O: HDMI in,A/V in, VGA, Audio outvideo compatibility: No video decoding functionInternal ...