Movement Caliber Number 5K65 Movement Type Solar Precision ±15 seconds per month Jewels 3 Functions Overcharge prevention function Quick-start function 24-hour hand Date display Case/Band Case Material Stainless steel Case Size Thickness:13.2mm Diameter:45.0mm Lug-to-lug:51.8mm Crystal Sapphire crystal Crystal Coating Anti-reflective coating on inner surface LumiBrite LumiBrite on hands, index(es) and bezel Clasp Three-fold clasp with secure lock , push button release with extender Bracelet Length 200.0 Distance between lugs 20 Other Details Water Resistance 200m / 660ft diver's Magnetic Resistance 4,800 A/m Features Unidirectional rotating bezel Screw-down crown Three-fold clasp with secure lock Screw case back