How It Works
There are two adhesive strips on the back side of the housing. The housing--attached to the side of the classroom door that comes in contact with the latch--traps the rubber slide but allows it to move side-to-side.
The slide prevents the door from being able to close completely.
As you can see below, leaving the slide in this position will prevent the door from closing the way it normally would. This prevents the latch from engaging.
Benefit: Students are able to easily enter or exit the classroom without disturbing others.
By moving the slide away from the edge of the door, the door will close completely and engage the latch.