Casio Men's G-Shock Waveceptor Atomic Solar Timekeeping Watch #GW002KA-3V  Amazon.com Product Description: Perfect for your active lifestyle, this Casio G-Shock men's digital sport watch (model GW002KA-3V) is solar-powered and wirelessly receives atomic time updates. This powerfully styled watch features a durable dark gray resin case and polyurethane strap. It offers a 1/100-second stopwatch with a 60-minute measuring capacity as well as four independent daily alarms (with one snooze alarm), world time from 30 cities, and an autocalendar (to the year 2039). And because it's solar-powered--charging in either sunlight or indoor light--you'll never have to deal with changing the battery. Other features include a scratch-resistant mineral crystal, AfterGlow LED electro-luminescent backlight, and water resistance to 200 meters (660 feet)--suitable for recreational scuba diving. This radio-controlled watch receives a time calibration signal transmitted from Fort Collins, Colorado, and signal reception is possible within a radius of about 2,000 miles from the Fort Collins transmitter. You can choose to automatically receive this signal four times a day, or manually update the watch to the atomic clock.