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When the door bell rings, only adults have the privilege to check whos there for the door mirror is high up. Up&down Door Mirror is designed for kids. It works like a periscope, so It can move up and down according to the height of the child. You can also leave a mark beside it every time you adjust the height as a memory of growing up.
Li Wang, Ying-hui Feng, Xin-ye Lv, Li-yan Gao