- The watch does not always come on when you turn on the same wrist quickly. - GPS is not accurate. My jogging has a mileage between 13 km and 15.5 km when I do exactly the same course and the error is even more striking on a small trail: 6 km and 8.5 km !!!! for exactly the same course. - The WORST: The band of the watch is easily removed, I lost it several times and found that the last jump, I realized too late for me and she was crushed by a car (?). My wrist is small: a jacket enough to win ... Conclusion: Stay away !!! The consumer SAMSUNG Service declined to commercial effort; even a symbolic gesture of style 1 euro !!!! I will never buy a SAMSUNG brand product because they are not shopping !!!