Using your Tag Heuer Monaco 39mm Automatic Chronograph is easy. Just wind the crown gently to start the watch and set the time. To use the chronograph function, press the top button to start or stop the timing, and the bottom button to reset. When you're near water, remember that it's water - resistant up to 100m, but don't press the buttons underwater. For maintenance, keep your watch clean by wiping it with a soft cloth regularly. Avoid exposing it to extreme temperatures and strong magnetic fields. Also, take it to a professional for servicing every few years to keep it running smoothly.