to a practical consumer product i've seen. the glasses have to be tethered to your android smartphone to provide the visuals and also the battery power. and that means you don't have to charge your glasses, which is great, but it will charge your phone's battery a bit quicker. it has built—in speakers and microphones and cameras on the front to track the room so that the visuals all stay in the right place where they're supposed to. and you have full freedom to get up and walk around and look at things, and the perspective changes as you move. it's really quite cool. the visuals come from two high—definition oled panels in the glasses that are beamed into your eyes via the lenses. and the visuals really do look bright and sharp. it's like a projector is shining images on the walls around you. now, the visuals don't fill your entire field of vision — turn your head, and things start to disappear. nreal says the glasses have a 52—degree field of view, and, in practice, it means whatever you look directly towards is