Citizen Men's Eco-Drive 200 Meter Dive Watch with Day/Date, BM8420-52A Light powered Eco-Drive Caliber E100 Japanese-quartz movement; Charges in natural sunlight or indoor light Max power reserve: 180 days; Low charge warning: 7 days; Quick start ability; Charge time from stop state to max charge: Incandescent Light - 46 hrs, Outdoors, Cloudy (10,000 Lux) - 14 hrs, Outdoors, Sunny (100,000 Lux) - 7 hrs Durable, hardened mineral crystal; Case diameter: 41 mm Stainless-steel case; Silver dial; Day-and-date functions Water resistant to 660 feet (200 M): suitable for recreational scuba diving