Citizen Men's BM6042-91A Eco-Drive Flexible Band Gold-Tone Stainless Steel Watch Light powered Eco-Drive Caliber E111 Japanese-quartz movement; charges in natural sunlight or indoor light Max power reserve: 180 days; low charge warning: 4 days; Quick start ability; charge time from stop state to max charge: Incandescent Light - 120 hrs, Outdoors, Cloudy (10,000 Lux) - 35 hrs, Outdoors, Sunny (100,000 Lux) - 11 hrs Durable, hardened mineral crystal; case diameter: 38.5 mm Gold-tone-Stainless-steel case; white dial; date function Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion