We built the Trestles Oceansearch with the absolute core surfer in mind. Using a 42mm lightweight & high-impact ABS plastic case and PU strap, it can continuously take whatever punishment you're willing to dish out. It also includes preprogrammed tide charts for over 200 preset beach locations world-wide, displayed tide height & range, and up to 10 years of future tide chart information. Other features include a dual-time display, moon phases, countdown timer, stopwatch, alarm, and back light. The Trestles is water resistant to 100 meters (330 feet) and backed with a 5 year limited warranty.