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Forgetful people are always bothered by various things, for example, they are not sure whether or not they have locked doors. That’s the main reason why ‘Smart Key’ is invented, and it can help to resolve such problems effectively. The key is pasted with a plastic piece to show the state of the lock. When you tend to lock the door, simply circumgyrate the key to the end and the plastic piece will be twisted to show information like ‘door locked’ on it; correspondingly, both the plastic piece and the information cue will then change as you use the key to open the door.

Designer：Jongoh Lee