linker / lock

This is a use of the magnetic force and the key mutual induction luminous lock.
The people take a bunch of keys in the life. due to the shape of the key is similar, so the people are not easy to distinguish them. But this lock solves the problem. When the proper key around the lock hole , it will appear a halo, which is convenient for people to quickly find. At the same time, the lock plays the role of lighting in the dark