Open a door.Nothing left / Public Toilet

Yuck! Previous user didn’t flush the toilet makes next user feels so uncomfortable in the public lavatory.
Moreover, some people think that there are lots of germs on the handle.Above are the problems of public health that haven’t been solved.

How can we solve these problems effectively?
Open the door and flush the toilet can work at same time with continuous steps.
When users press the switch by feet in order to open the door, the flush system will work at meanwhile.
This can not only avoid the users to touch the handle but also keep the public toilet clean.