Citizen Women's EG2580-58D Eco-Drive Silhouette Diamond Accented Dress 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: 15 mm Stainless-steel case; Mother-of-Pearl dial Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion