Sign up for
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
Theory of the design:
This is a key with a small plate inside that can be retractile to tell people whether he or she locks a door or not.
It is usually that people forget to do or doing something, especially something trivial, such as lock a door. People often forget whether he or she has locked a door when going out. This key is designed to solve this problem. Based on keys we commonly use, this key is added the setting of a small plate inside that can be retractile.
Shuangxin Lin , Lei Yuan , Hang Zhou