This watch receives WWVB radio signals from five atomic clocks across the world, which will neither gain nor lose a second in 30 million years, ensuring accurate timekeeping when traveling. The watch can synchronize with an atomic time signal from up to 2,000 miles away from one of the atomic transmitters located in Fort Collins, Colorado; Rugby, England; Mainflingen, Germany; Fukushima and Fukuoka, Japan, while only requiring you to set your current location at the touch of a button. The watch also calibrates Greenwich Mean Time in 48 world cities and across 29 time zones. A solar panel in the face powers the battery, an integrated stopwatch measures elapsed time, split time, and first and second place times down to 1/1000 of a second. With four daily alarms and a snooze button, hourly chime, and countdown timer. Water resistant up to 660'. Diam. (2 1/2 oz.)