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.
This is a key designed to help owners check whether the door has been locked or not. There is a cloud-shape memory sponge inserted in the key. After using the key to lock the door, memory sponge would deform, preserving fingerprints on as a sign. When the user forgets whether he had locked the door , he can check if the fingerprint can be seen.