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The Casio Pathfinder PAW1300B-4V watch and wrist-top information center keeps time via the accurate Atomic Clock and draws its power reliably from the sun! Automatically receives Atomic Clock time calibration radio signals up to 6 times a day in the U.S., England, Germany and Japan for incredibly accurate timekeeping. No batteries to replace! This compact unit has a large-capacity solar storage battery that requires very little light to recharge. Fully charged battery will power watch for up to 5 months without exposure to light. Small sensors detect direction, altitude and temperature, keeping you in tune with the world around you. Digital compass with 16 points of measurement and bearing memory displays current heading; reports bearing in 1° increments from 0 to 359°. Altimeter tracks elevation gain and loss from -2,300 to 32,800 ft. (-700 to 10,000m) in 20 ft. (5m) increments. Altimeter memory captures up to 40 records of high/low altitude, cumulative ascent/descent, month, date and time. Altitude tendency graph positions you with respect to your target altitude. Detect change in the weather—barometric tendency graph charts the weather changes. Barometer tracks atmospheric pressure changes from 260 to 1,100 hPa (7.68 to 32.49 in Hg). Thermometer ranges from 14 to 140°F (-10 to 60°C) measured in 0.2°F increments (0.1°C). Electroluminescent backlight activates automatically by simply tilting your wrist 40° toward you from the horizontal. 1/100-second stopwatch measures elapsed time, split time and first and second-place times. Features countdown timer, time in 12- or 24-hour format, world time with 29 time zones (30 cities), date, day, auto calendar (through 2099), 5 daily alarms and an hourly chime. The Casio Pathfinder PAW1300B-4V watch is water-resistant to 100m (330 ft.).