Here’s what consumers have asked with answers from Coin staff and previous consumers.
Good question. I can't answer that one. But that is also possible with a single credit card with multiple swipes. You can configure it so that if the Coin gets beyond bluetooth range, it will lock and notify your phone (e.g., if you forget your Coin and walk away). Usually a credit card reader at a restaurant is within bluetooth range, so the locking mechanism wouldn't help (and besides, if the Coin is locked, you can't use it to make a charge).