This is a simple device to allow Autistic or other Non-Verbal communication between students and adults. It has icons for various mood states, plus tired, hunger, thirsty and toilet. The four holes are to allow you to attach a key chain, lanyard, or even possibly turn it into a necklace. I printed the main part at 10% infill and changed the filament color at 4 mm Z height. The arrow and back slide pieces were printed at 50% infill.