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Have you had such an experience: when you need to toilet while the toilet is in use and you have to wait outside anxiously because you dont know how long it will last.
To solve this problem, we have redesigned the door-lock of the toilet.It can tell the waiting time to people. Let people get the mental preparation to release the sense of anxiety.
Red: means you have to wait for a long time
Yellow: means you dont need to wait for long
Green: means nobody is in
Haoyu Zheng,Guangqian Li,Shan Guan, Minjia Wang,Lei Li