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In modern society, people are easy to forget things such as locking doors when going out, moreover people may not clearly remember they have locked the door or not, and this worry may troubled peoples thought through their day. Therefore, if our keys can tell us have we locked the door or not, it will not only save our time but also our day.
The general idea present as the door lock with electrical storage device, and the key was fabricated with a LED device. While the key inserts to the keyhole, the storage device will give power to the key and make the LED part keep glowing/flashing for about 1 2 minutes.