Summary: Personal Experience I am yet to find a video format that this projector will play despite its advertising. Not any of my standard MP4's and not avi. So basically it doesn't work in stand alone mode unless you just want to show slides - which is pretty useless for a pico. The USB connectivity is just for uploading data, not for projection. USB connectivity is only available if you buy another specialised cable. HDMI cable is also not supplied.
Summary: It is a fantastic little project; however, there are two annoying features relating to the HDMI input. The HDMI input is for "mini" HDMI, so you will need to buy a special cable to connect this to 95% of the HDMI equipment you're likely to have. When you consider that the £22 Raspberry Pi (which is the same size) has a normal Type A HDMI socket, I don't think there's much excuse here. The second problem is the proximity of the HRMI input to the power input.