Citizen Eco-Drive Men's Skyhawk A-T Watch #JY0000-53E  Amazon.com Product Description: Sporting a rotating slide rule bezel, the Citizen Skyhawk A-T stainless steel men's flight watch offers advanced timing functions and the latest technology. It's powered by Citizen's unique Eco-Drive, which absorbs sunlight and any artificial light through the crystal and dial to recharge the watch continuously. The fast-forward timekeeping features include time and calendar in 43 cities, thirty cities, three world time alarms, a 99-minute countdown timer, one-touch interchangeable analog/digital time, and 1/100-second chronograph that measures up to 24 hours. The large round silver stainless steel case measures 48mm (1.89 inches) wide and 16mm (0.63 inches) deep. The black dial background features large white hands with luminous tips as well as luminous square dial markers. It's completed by a stylish multi-link stainless steel braclet band. Other features include water resistance to 200 meters (660 feet)--which will stand up to the rigors of recreational scuba diving. Eco-Drive Frequently Asked Questions How can you tell if the Eco-Drive watch is getting enough light? In normal use, the watch displays the time and the sweep-second hand moves in one second intervals. A very important feature of Eco-Drive is the Low Charge Warning Mode which as a result of low battery voltage, causes the second hand to jump two seconds at a time (while still keeping correct time). How long will an Eco-Drive watch run after it is fully charged? If your watch is put away where no light is available to it while in a fully charged state, depending on the model, it will run for from 45 days to 5 years. How can the Eco-Drive watch be recharged? Besides sunlight, it can be safely charged by exposing it to a fluorescent desk lamp, with the dial (face) up and within about 8 inches or an incandescent lamp (regular light bulb) no closer than 20 inches. Never use a halogen lamp since the heat generated by it can cause damage to your watch. The most efficient and the quickest is in direct bright sunlight (not windowsill) and never on the dashboard of a car.