Your car has a horn, and in this day and age that horn has one meaning: I’m upset. Of course, that might not always be your intention, and sometimes you have to take to the horn for other reasons — maybe to warn someone about something you suspect they haven’t seen. You’ve only the horn as your option, though, and so you shelve your message and move on, knowing in some places a friendly beep might instigate a not-so-friendly case of road rage. Thusly enters Mr. Henry, a crowdfunding project that comes in the form of a connected speaker, an app, and whatever phrases you feel like recording.
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https://www.slashgear.com/mr-henry-car-horn-lets-you-beep-messages-at-others-10387804/