Casio Men's PRW5100G-4 Pro-Trek Tough Solar Atomic Analog-Digital Watch Tough solar power; Battery power indicator, power saving function, solar rechargeable battery approx. Battery life: 5 months on full charge (without further exposure to light) Full auto led light with afterglow; 5 daily alarms; Countdown timer Water-resistant to 330 feet (100 M); Additional band, low temperature resistant (-10 C / 14 F), full auto LED light with afterglow Multi-Band 6 Atomic Timekeeping, 100M water resistant, Digital compass, Altimeter, Barometer, Thermometer, World Time (29 cities + UTC), 1/100 second stopwatch, 12/24 hour formats.