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Door Ring is designed to make a new habit for people to use door handle.
Door Ring has two situations. One is locked, another is closed.
When the doors are locked, the handles will be interconnected with a small lock between them. It looks like a ring bunches the doors. When the doors are just closed, the handles will be separated from the initial position. They are just normal handles, the door can be opened by simply twisting the handle.
By using Door Ring, the doors will have one more lock in handles, and it is very easy to see if the door is locked.