316L Stainless Steel: The highest grade of stainless steel for water resistance, strength and non-corrosion in a marine environment.Automatic Tide System (ATS): Rip Curl's patented averaging tide system. Easily set to thousands of beaches worldwide.Pre-Programed Sunrise & Sunset TimesPre-Programed Moon PhasePre-Programmed Tide Function: Electronically stored tide charts for 200 preset locations world wide.Screw Down: 4 seals for extreme water resistance.Dual TimeLightCountdown TimerStop WatchAlarmDate & TimeHeat Bezel: A countdown timer on an analogue watch. Kepps track of time for anything from surf heats to the time left on your parking meter.Depth Tested to 200m