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Every time I see the school's administrators are open to open the classroom door, I found two problems: First, they can not identify the keys once. This is a waste of time. Second, in the evening when they open the door, they all need lighting tools. So inconvenient. So I did a design to solve this problem. Different color fluorescent stickers key, whether it is night or day can quickly open the door.
Xiemin Chen Chiqiang Wang Yanlong Ma Junjie He