Citizen Men's AU1000-53A Eco-Drive Dress Watch Light powered Eco-Drive Caliber J165 Japanese-quartz movement; Charges in natural sunlight or indoor light Max power reserve: 270 days; Charge time from stop state to max charge: Incandescent Light - 190 hours, Outdoors, Cloudy (10,000 Lux) - 60 hours, Outdoors, Sunny (100,000 Lux) - 11 hours Durable, hardened mineral crystal; Case diameter: 37 mm Stainless-steel case; Silver dial; Date function Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion