Very interesting concept. We use them for dog training. More fun than anything. The dog always wants a treat so I'm not sure we need a button to let us know. It has a dog door so we don't need a button on the outside but I think it would help if you didn't have a dog door but then again the dog can just sit next to the door. But we're glad we have them. It was fun to experiment. Our dog took the treat button pretty quickly.
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