Movement Caliber Number 8T63 Movement Type Quartz Precision ±15 seconds per month Battery life Approx. 3 years Functions Case/Band Case Size Thickness:12.1mm Diameter:41.5mm Lug-to-lug:46.5mm Crystal Hardlex Distance between lugs 22mm Other Details Water Resistance 10 bar Magnetic Resistance 4,800 A/m Weight 133.0g