Reminder Button to Help You Not Forget in the Real World

Why?

It would be helpful if I could remember to do something that is connected to a specific place in the real world.

How?

Have a small button you can place anywhere (magnetic, adhesive back etc.). You record a message on it like “throughout old stuff”, and place it where you need to do what you need to do. When you come close to it it will play back what you recorded.