Citizen Eco-Drive x Analog ft. Elegance Men Casual Formal Hexagon 100m Water Resistant Watch BJ6538-87E BJ6538 BJ-6538Experience timeless sophistication with a watch that masterfully blends classic style with modern reliability. Powered by innovative Eco-drive technology, this stylish timepiece harnesses energy from any light source, ensuring a maintenance-free experience that's as sleek as it is sustainable.Caliber Number / MovementE031 (solar Eco-Drive)Power Reserve / AccuracyApproximately 6 months when fully charged (+/-15 seconds per month)CrystalMineral crystalLuminousNilCase & Band MaterialStainless steel case with metal band (three-fold clasp with push-button release)Water Resistance100m / 10 barCase SizeThickness: 9.6 mmDiameter: 41.0 mmOther SpecificationsCitizen Eco-Drive x Analog ft. EleganceInsufficient charge warning functionOvercharge prevention functionRegular timekeeping (analog display)