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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.
Hunan University
Changsha, China
Fangqing Liu,
Hunan University
Yi Wu,
Hunan University
He Wang,
Hunan University
Deng Peng,
Hunan University
