Citizen Women's EG2550-59D Eco-Drive Silhouette Diamond Accented Watch Light powered Eco-Drive Caliber G620 Japanese-quartz movement; Charges in natural sunlight or indoor light; Citizen Eco-Drive diamond watches feature conflict-free and single cut diamonds 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; Water-resistant to 99 feet (30 M)