Movement Caliber Number V147 Movement Type Solar Accuracy ±15 seconds per month Duration Operating for approx. 10 months (when fully charged) Exterior Case Material Stainless steel Crystal Sapphire crystal LumiBrite LumiBrite on hands, index(es) and bezel Clasp Three-fold clasp with secure lock , push button release with extender Other Details Water Resistance 200m / 660ft diver's Case Size Thickness: 10.6 ㎜ Diameter: 38.5 ㎜ Length: 46.5 ㎜ Weight 149.0 g Bracelet Length 205 ㎜ Other Specifications Screw case back Screw-down crown Three-fold clasp with secure lock Unidirectional rotating bezel Other Features Date display Overcharge prevention function Quick-start function