Calibre Number V157 Movement Type Solar Precision ±15 seconds per month Power reserve Operating for approx. 10 months (when fully charged) Jewels 2 Functions Overcharge prevention function Quick-start function Date display Case/Band Case Material Stainless steel(hard coating) and plastic Case Size Thickness:12.6mm Diameter:46.7mm Lug-to-lug:45.8mm Crystal Hardlex LumiBrite LumiBrite on hands and index(es) Band Material Silicone Distance between lugs 22 Other Details Water Resistance 200m / 660ft diver's Features Unidirectional rotating bezel Screw-down crown Screw case back