Shock Resistant. 200M Water Resistant. Auto EL Backlight with Afterglow. Atomic Timekeeping. Solar Powered. World Time (30 Cities). 1/100 Sec. Stopwatch. 4 Daily Alarms / 1. Snooze Alarm. Hourly Time Signal. Auto Calendar. 12/24 Hour Formats. The Casio Atomic Powered watches receive a time calibration signal transmitted from Fort Collins, Colorado. Signal reception is possible within a radius of about 2,000 miles from the Fort Collins transmitter.