TECHNOLOGY Tough Solar solar-charging system convents sunlight, fluorescent, and other light sources into power Super Illuminator LED backlit display shows information in crystal clear quality in any lighting condition Mineral glass and 200-meter water and shock resistant resin case construction protects against impact and vibration letting you take your watch through the toughest of environments Battery Life: 8 months on rechargeable battery with normal use without exposure to light after charge Memory capacity: Up to latest 45 records (measurement start month, date, hour, minute, lap/split times, total time, distance, average pace, calories burned, lap number, time, distance, average pace of each lap/split) World time modes covering 31 time zones, daylight savings on/off setting Countdown timer range: 24 hours Battery Level indicator Full auto-calendar (to year 2099) 12/24 hour-format Regular timekeeping: Hour, minute, second, pm, month, date, day LED: White Size of case: 51.3×48.9×16.6mm Total weight: 61g USES Designed and engineered for use by those whose work takes them into extreme environments scattered with rubble, dirt, and debris SPECIAL FEATURES Time stamp functionality lets you record the current time in memory by the touch of a button Automatic time calibration signal reception Digital Compass and graphic direction pointer measures and displays direction as one of 16 points Altimeter measuring and memory allow to you keep track of the height of your activity Atmospheric pressure features offer a visual graph and keep track of the past 42 hours of readings Built-in thermometer 5 daily alarms with 1 snooze alarm Hourly time signal Low battery alert notifications Power Saving mode allows you to conserve battery life when not in use