Usually the business card itself is the reminder to get in contact with whoever gave it to you. But this is Hackaday, after all. This solar-powered card reminds the recipient to send [Dead Rat Productions] an email by beeping about every two hours, although the gist of that email may simply be begging them to make it stop, provided they didn’t just toss the thing in the garbage.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/07/08/2024-business-card-challenge-a-very-annoying-business-card-indeed/