Improved the rooms thestatus or adjoining space are used to indicate the present invention discloses a kind of, equipment includes that desired its edge second polate alongadjacent is mutually hinged, and spring pushes the second plate to be passed through normally closed position covering and be parallel to firstplate and adhesive tape or other fasteners to connect the first plate surface door. Magnet or equivalentdevices are for temporarily connecting the second plate lens surface, such as on doorframe, neighbouring and extendingat angles are to the surface of door, it wherein is formed with the second plate and the second face between relativemovement separate second ground subsidences, wherein the second plate itsnormally automatically returns to closed position.
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