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We often try to recall if the door is well-locked after having left the house, but
become anxious not being able to go back and check.
LOCKEY is a device which allows its user to immediately check if the door is locked.
The combination of the switch inside the key and the act of the key turning in the lock
enables the color sign on the key to change.
Red means unlocked, and Green means locked.
Shuo-Ying, Li Kuan Ling, Lee Ka Kit, Fong