Calibre Calibre no. V157 Movement Type Solar Accuracy ±15 seconds per month Power Reserve/Battery Life Operating for approx. 10 months (when fully charged) Case Case Material Stainless steel Crystal Sapphire crystal LumiBrite LumiBrite on hands and index(es) Layout Water Resistance 20 bar Case Size Thickness: 10.7 ㎜ Diameter: 42.8 ㎜ Length: 49.2 ㎜ Other Specifications Overcharge prevention function Quick-start function Date display Features Other Features Screw case back Unidirectional rotating bezel