Using your LEFF Amsterdam D42 Tube Watch is easy. Just put on the leather strap and adjust it to fit your wrist. The watch face is clear and easy to read, showing the time at a glance. When it comes to water resistance, it can handle splashes and short swims up to 50 meters, but don't leave it underwater for too long. For maintenance, keep the watch clean by wiping it with a soft cloth regularly. Avoid exposing it to harsh chemicals or extreme temperatures, as this can damage the 316L stainless steel case and leather strap. If you have any issues, you can return it within 30 days.