Casio Men's watch GW300A-1VG-Shock Tough Solar Atomic Collection - never need to change the battery. The Casio Atomic watches receive a time calibration signal transmitted from Fort Collins, Colorado. Auto Calendar. Digital display. Countdown Timer. Solar Powered. Stainless steel caseback and bracelet. Auto El Backlight. Water resistant to 200m. 4 Alarms with snooze. World Time. 1/100 Second Stopwatch. Shock Resistant. Case measures 44mm diameter by 16mm thick. 1 year original manufacturer warranty.