Casio Men's PRG-270-7CR "Pro Trek" Resin Digital Solar Watch Imported Tough Solar Power, 100M Water Resistant, Low Temperature Resistant (-10 C / 14 F), Altimeter, Altimeter Memory, Digital Compass, Barometer, Thermometer, Full Auto LED (Super Illuminator) Backlight with Afterglow, World Time, 31 time zones (48 cities + UTC), city name display, daylight saving on/off, Sunrise/Sunset Data, 5 Daily Alarms (4 one-time and 1 snooze alarm) Hourly Time Signal, 1/10 Second Stopwatch, Countdown Timer, Full Auto Calendar (Pre-programmed until the year 2099), 12/24 Hour Formats, Button operation tone on/off, Storage Battery: Solar Rechargeable Battery, Battery Level Indicator, Power Saving Function, Approx. Battery Life: 9 months on full charge (without further exposure to light), Module 3415