With the Oceanus Atomic Solar Chronograph watch, Model number OCW600TDBA-Oceanus gives you one watch with everything you need, looks and features. Oceanus watches synch up automatically several times daily with the national atomic transmitter for exact accuracy anywhere within 2000 miles of Fort Collins, CO. Sunlight or indoor light charges the internal battery which will hold a charge for several months. A power saving feature preserves power when the watch is not in use. Black dial features three white chronograph windows, a date window, and a luminous hour and minute hand.