Movement Caliber Number V157 Movement Type Solar Accuracy ±15 seconds per month Duration Operating for approx. 10 months (when fully charged) Exterior Crystal Hardlex LumiBrite Lumibrite on hands and indexs Band Material Silicone Other Details Water Resistance 200m / 660ft diver's Case Size Thickness: 12.6 ㎜ Diameter: 46.7 ㎜ Length: 46.1 ㎜ Other Specifications Screw case back Screw-down crown Unidirectional rotating bezel Other Features Date display Overcharge prevention function Quick-start function