women’s door handle / door handle

In China,women going to the toilet often have to wait in line and they usually don't know how long they need to wait outside.In order to solve this problem,we improve the toilet door handle.People inside the toilet can revolve the door handle to give tips to the one who is waiting outside. The color green is said no one is inside;the color yellow is said "a short time"；the red is said "a long time". So women who is waiting outside can choose the right position to wait.