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It is not easy to open the door in the dark. Finding the correct key to match the key hole usually takes time. Especially when there are many similar keys in the key holder, we even need to try several times to get correct match.This concept is to find the correct key by the matched colors with the key hole. Use the same colored labels to distinguish the key with the key hole. The label is made of luminous material that users can easily find the correct key and key hole in the dark.
National Taiwan University of Science and Technology