Citizen Women's EG2380-57E Eco-Drive Silhouette Crystal Accented Bangle Watch Light powered eco-drive caliber G620 Japanese-quartz movement; charges in natural sunlight or indoor light Max power reserve: 240 days; low charge warning: 8 days; charge time from stop state to max charge: Incandescent Light - 120 hrs, Outdoors, Cloudy (10,000 Lux) - 35 hrs, Outdoors, Sunny (100,000 Lux) - 6 hrs Durable, hardened mineral crystal; case diameter: 14 mm Stainless-steel case; black dial Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion