The fastest choice / The fastest choice

In daily life, many people in the toile spending a lot of time, as it happens in the end to how long someone waiting outside,the outside people do not know how many time the inside people need，this design of the door lock is in order to solve this problem by adjusting door handle of the length of the time，to tell the outside people how many time the inside people need，so people waiting outside can clearly know which cells toilet is the fastest the man out of the toilet.
The lock will automatically unlock if you stay in toilet more than hour，to avoid people fainted in the toilet and locked in toilet.