Citizen Eco-Drive x Analog ft. Perpetual Calendar Men Casual Formal Round 100m Water Resistant Watch BL8160-07X BL8160 BL-8160Make a stylish impression with this high-performance timepiece, featuring dual time, 1.5 years power reserve, and advanced chronograph functions. Powered by innovative Eco Drive technology, it harnesses any light source to eliminate battery replacements, ensuring precision and reliability.Caliber Number / MovementE870 (solar Eco-Drive)Power Reserve / AccuracyApproximately 7 months when fully charged (+/-15 seconds per month)CrystalSapphire crystalLuminousLuminous on hands and indexesCase & Band MaterialStainless steel case with leather band (deployment clasp with push-button release)Water Resistance100m / 10 barCase SizeThickness: 11.1 mmDiameter: 42.0 mmOther SpecificationsCitizen Eco-Drive x Analog ft. Perpetual CalendarDay. date, dual time and 24-hour displayAlarm functionPerpetual calendarDaylight saving functionInsufficient charge warning functionOvercharge prevention functionRegular timekeeping (analog display)