Caliber Number V131 Movement Type Solar Accuracy ±15 seconds per month Duration Operating for approx. 6 months (when fully charged) Exterior Case Material Stainless steel Crystal Hardlex LumiBrite Lumibrite on hands, indexes and bezel Band Material Silicone Other Details Water Resistance 200m / 660ft diver's Case Size Thickness: 10.4 ㎜ Diameter: 38.7 ㎜ Length: 40.4 ㎜ Weight 64.0 g Other Specifications Screw case back Screw-down crown Unidirectional rotating bezel Other Features Overcharge prevention function