Using your TAG Heuer Carrera Chronograph is easy. To set the time and date, pull out the crown and turn it. For the chronograph functions, use the push - buttons on the side. When you're done using the chronograph, just press the reset button. Remember, although it's water - resistant up to 100m, don't open the crown underwater. To keep your watch in great shape, clean it regularly with a soft, dry cloth. Avoid exposing it to extreme temperatures or magnetic fields. If you have any issues, take it to an authorized TAG Heuer service center.