Using your Tag Heuer Formula 1 Chronograph is easy. To start or stop the chronograph function, press the top button. The bottom button resets it. To set the time and date, pull out the crown. For regular use, it can handle splashes and swimming up to 200m. But avoid high - pressure water activities like scuba diving. When it comes to maintenance, keep the watch clean by wiping it with a soft, dry cloth regularly. If you notice the battery is running low, take it to an authorized Tag Heuer service center for a replacement. Don't try to open the case yourself as it may damage the watch.