Movement Caliber 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 Case Size Thickness:10.7mm Diameter:42.8mm Lug-to-lug:49.2mm Crystal Sapphire crystal LumiBrite LumiBrite on hands, index(es) and bezel Band Material Silicone Bracelet Length 205.0 Distance between lugs 20 Other Details Water Resistance 200m / 660ft diver's Magnetic Resistance 4,800 A/m Weight 93.0 Features Screw case back Unidirectional rotating bezel Screw-down crown Screw case back