... to choose: (specially for pico projector)a. PCBA board 301: Multimedia I/O: HDMI in, USB2 ... Battery: Yes, 1 Hour battery lifeProjector Sample: Avaliableb.PCBA board 302: Android 2.1OS with WIFI I/ ... : Yes, 1 Hour battery lifeProjector Sample: Avaliablec.PCBA board 303: Wince 6.0 OS with WIFI ... Battery: Yes, 1 Hour battery lifeProjector Sample: Avaliabled. PCBA board 304: Accessory projector I/O: HDMI in, ...