Citizen Women's EW3114-51D Eco-Drive Corso Diamond Accented Two-Tone Watch Light powered Eco-Drive Caliber E001 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: 180 days; Low charge warning: 4 days; Quick start ability; Charge time from stop state to max charge: Incandescent Light - 130 hrs, Outdoors, Cloudy (10,000 Lux) - 40 hrs, Outdoors, Sunny (100,000 Lux) - 11 hrs Durable, hardened mineral crystal Water-resistant to 99 feet (30 M)