Using this TAG Heuer Aquaracer is easy. To set the time and date, unscrew the screw - down crown and pull it out to the appropriate positions. You can turn the bezel to measure elapsed time when you're underwater or during other activities. When it comes to water resistance, it can handle depths up to 200 m, but don't open the crown underwater. For maintenance, keep the watch clean by wiping it with a soft cloth regularly. Avoid exposing it to extreme temperatures and strong magnetic fields. If you're not wearing it for a long time, wind the watch occasionally to keep the movement in good condition.