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Various switches become ineffective due to the spatial transformation and need to readjust hardware allocation. It is convenient to control electric appliance if the position of the switch can be adjusted freely.
Arbitrary switch, applying the laser image on the interface projected by the central control system, replaces the traditional switch and is a medium to control the electric appliance. Sensing the approach of the body by laser range finder, virtual instruction is projected on the interface to help user. It has a snapshot to detect the switch to realize the synchronous control while sensing the operation by the central system.