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When you are outside of the toilet , you can know if there is space and you can avoid waiting inside or get in and out again and again.
The light is on means someone is there , The light is off means nobody is there ftoilets.
It is a Block-based design , it can be assembled according to the space of the toilet.
The Block-based design is easy to exchange and transport .
East china jiaotong university
nanchang jiangxi, China
East china jiaotong university
nanchang jiangxi, China