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Link is a new type membrane, which establishes links between the key and the lock. There are two kinds of menbranes in each set, L is for a lock while K is for a key. When the distance between L and K is less than 50 cm, they will be induced to emit light. L helps to find the right key quickly and K shows the position of the lock when the light is dim. Only the same set L and K can be induced.
of Science and Technology
Ding Xiaolong Wang Han Lu Wei Lv Long