This design is inspired by nature and both the bezel and strap are made from eco-friendly biomass plastics, using renewable organic resources to reduce environmental impact. Eco-friendly and functional, these watches bring the tide charts and lunar data they need to take on waves around the world directly to the surfer's wrist. Case and bezel material Case and bezel material: Bio-based resin Bio-based resin strap Impact resistant Water resistant Water resistant to a depth of 200 meters (650 feet) Power supply and battery life Approximate battery life: 3 years at CR1616 Glass-Mineral Crystal World time with 29 time zones (48 cities), display of city codes and activation/deactivation of daylight saving time. Moon phases Moon data (moon age at the specific date and moon phase graph) Tide graph-Tide graph (tide level at specific date and time) Stopwatch-Stopwatch 1/100 seconds, measuring capacity: 23:59'59.99''. Measurement modes: elapsed time, fractions of time, time of 1st and 2nd position. Other: automatic start of the 5-second countdown. Countdown timer unit of measurement: 1 second Countdown interval: 24 hours Countdown start time setting range: Between one minute and 24 hours (1 minute and 1 hour increments) Others: Automatic repeat, timer alarm, activation/deactivation of the audible progress indicator Alarm / time signal 3 multi-function alarms (with one snooze alarm) Time signal Light alert function Light alert (LED indicator) Flashes with an acoustic signal for alarms, time signal, countdown timer time-out alarm, countdown timer progress sound indicator and automatic start of stopwatch Illumination LED backlighting (super-illuminator), selectable illumination duration (1.5 or 3 seconds) and brightness LED: white Full automatic calendar (up to the year 2099) Mute function Activation or deactivation of the button press tone Accuracy: ±15 seconds per month Other options 12 and 24 hour format Normal time display: hour, minutes, seconds, p.m., month, date and day