Atomic radio-controlled watches are the most precise time-keeping devices in the world. Inside is a radio receiver that synchronizes every day with the U.S. atomic clock in Colorado and resets for Daylight Saving Time. This first-generation international atomic watch receives signals from atomic clocks in the continental USA, the UK, most of Western and some of Central Europe and most parts of Japan and South Korea. Features include stopwatch; countdown; two alarms, 12- or 24-hour timekeeping, +/- 23-hour offset function, calendar and backlight. Water-resistant to 3ATM (30 meters). Runs on one CR2032 battery (included). Select red or gray. Measures 2 1/4" x 3" x 1 3/4" and weighs 2 1/2" oz. 90-day warranty.