The Timex WR 50M is part of the 1440 Sports watch set. It was named the 1440 because every day has 1,440 minutes in it. The Timex WR 50M uses a snap back for the cover plate for the battery. To change ...

You must reset your watch after replacing the battery. Press and hold the "Set/Clear" button on the bottom right of the Timex Marathon. A message will appear reminding you to hold the button for two ...