Citizen Men's BM6645-53E Eco-Drive Dress Diamond Accented Black Ion-Plated 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; 36 Genuine diamonds-accented bezel Black anodized stainless-steel and bracelet; Black dial with silver-tone hands and markers; Date function Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion