Rearview mirror for backseat. One purchased from Baby R Us and one purchased from Nishimatsuya. I used to use a small mirror, but it would shift easily and be hard to see, so I replaced it with this larger type and used it for about a year. There are water wipe marks on the mirror surface, but there are no problems with use, and I think it's still a usable item. For twins or children close in age.