I am happy to see that the doorbell successfully functions.
But I am also thinking about does this device indeed brings convenience to human life or no. It is absolutely interesting for a doorbell to have a color preference, but what if there is an emergency? What if someone really needs to see me but is not wearing the "correct color"? After all, machines are built to serve people and help make a better life. I hope I can come up with better solutions to this in the future.
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