Citizen Men&#39;s BM6664-59E Eco-Drive Two-Tone Watch 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; brushed and polished stainless-steel case and bracelet Black dial with gold-tone hands and markers; date function at three o'clock Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving