Is true that there's a wristwatch that can be charged with the hand's pulse?!
Question:
Is true that there's a wristwatch that can be charged with the hand's pulse?
I also heard that those kind of wristwatches are dangerous for the human body. Any answer will be appreciated.
Answers:
It's called an "auto-wind" or "self-wind" watch. It's got nothing to do with your pulse. It's about arm movement.
For a good explanation of how it works, go to:
http://www.timezone.com/library/rdnotebo...