A video projector which will work from your laptop's HDMI socket (HDMI cable supplied) or from a memory stick. Ideal if you have to give some sort of presentation and the venue doesn't have a projector. No real need for a screen if you're desperate. A blank white (or light) wall will do well enough. It's quite bright, but you would be better to use the curtains or the blinds on a bright day. The smallest focused picture you'll manage is about two metres across. It's 1080p HD so the picture has reasonable resolution, even though it's large.