Treated myself to an upgrade from my perfectly functional Galaxy watch to the new watch 4 classic. As you may probably guess from the title it doesn't vibrate because of the tattoos I have on my left arm. Turned my watch over, works. Put it on my right arm, works. This didn't happen with the old watch, it's the feature where it will not vibrate if the watch doesn't think you are wearing it and you can't turn this feature off! This is really shocking, you would think a watch as expensive as it is and made by a company such as Samsung wouldn't have this type of issue. Completely unacceptable