iPhone 5 Headphone jack -droplet of water-sensor?

I had my iPhone replaced today at the Apple store. The genius popped out the SIM card to check for water damage. There is a water sensor on the screen side of the SIM card slot. There is also another one internally next to the sleep/wake button.

 

I would assume so, however, I am very careful to not allow any water to hit the phone. I would guess that if a drop of water did make its way into the headphone jack and the jack still worked after it dried out, you would be safe and no water sensors would have been tripped.

I use my phone all the time while running, cycling, and any other working out. I'm always worried about a drop of sweat hitting it and doing some kind of damage. Snack sized Zip lock bags work great to keep the phone dry.

 

There is one in there. Don't get water in there.