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This item, and the numerous generic items like it, are not clear about what they're offering. This is a simple tool to exploit the 'Pepper's ghost' illusion, where a pane of glass (or plexiglass, in this case) has an image projected onto it (from your phone) which can then be viewed like a 'hologram' in front of whatever's behind the glass. This not like an actual digital projector you would use, and the plexiglass itself has no special properties. The illusion can only be viewed from in 'front' of the plexiglass, or the same side the phone is on. All of that being said, it works extremely well, and for ~$9 there is not a better tracing tool available. Do note that the image will be mirrored from its original orientation, so if you're intended to use this to trace text or a specific image onto another surface you will need to 'mirror' it from within your phone first.
I'm writing this review specifically because I was confused by what these various devices were claiming to offer (for awhile I thought they offered lenses which worked alike those found inside digital projectors), but now I realize they are simple examples of the Pepper's ghost illusion. (The same technique is used within the Haunted Mansion ride at the Disney theme parks, where screens embedded in the floor project images onto glass panes that make it appear as though ghosts are really effervescently moving around the attraction. Obviously this is not *quite* as profound, but I appreciate the tool none-the-less.)
Well, if you have to do drawing for yourself, then I do not recommend it at all. If you want to give it to your 5 to 10-year-old kids then give it try. Quality of this product is not perfect at all. I didn't use it till yesterday and find out that by keep them in closet left scratches on screen even protector shield was on too. Mirror size was small too, but quality is destitute.