SHUTTER ONLY CHANGES WHEN YOU PUSH ITEasy to change manually between CLEAN and DIRTY. However, it won't change by itself when you open or close the dishwasher door because inside there is resistance that will keep shutter sign stay in place. NON-SCRATCHING STRONG MAGNETThe clean dirty dishwasher magnet has a full size soft magnet on the back side, which is strongly magnetic. Inbuilt industrial magnets are covered by soft silica to protect your dishwasher. NO MORE CONFUSIONARE THE DISHES DIRTY OR CLEAN? Answer the question and end the frustration with the NEWEST 2018 Dishwasher Magnet. Easy to read, know at a glance if dishes are washed- even if you're across the room or missing your eyeglasses!! WORKS ON ANY DISHWASHERSThe clean dirty dishwasher magnet includes two options to attach to your dishwasher. It has a full size soft magnet on the back side. The package comes with two pieces of double sided adhesive tapes in case that your dishwasher is not magnetic. (Even if you use the double sided adhesive, there will not be any residue left when it's removed from your dishwasher.)