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It greets you when the fridge door is opened, and starts complaining when the door remains open for too long.
Apart from this, the cute product by APPARE STORE doesn't have any realistic practically, you can think of it as a waste of resources... in a way.
But for me, I'd love to get one of these (I said they're cute).
Sometimes it is more sustainable to seek such kind of small happiness in life, of which the sources can be the most common and trivial things around you.
In fact, there're many products like this out there, given their relatively small sizes and lack of complications.
What about architecture?