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This is a "key and lock" design, mainly for the elderly and the environment for use in the dark crowd, we know that each one of us has many keys back, and they are all together, one holding a bunch of keys to open the door, will be to find the right key, so a lot of time to waste for the elderly, this process will be more difficult, so the design for the key with a lock to make improvements, when the correct key to close locks, the lock and keys will be issued by the appropriate lighting to make prompt to the user, only the right key to close the right door lock light will light