Specifications Movement Caliber Number 4R36 Movement Type Automatic with manual winding Power reserve Approx. 41 hours Jewels 24 Functions Stop second hand function Day/Date display Case/Band Case Material Stainless steel Case Size Thickness:11.5mm Diameter:40.0mm Lug-to-lug:44.6mm Crystal Hardlex LumiBrite Lumibrite on hands and index(es) Band Material Nylon Distance between lugs 20mm Other Details Water Resistance 10 bar Weight 75.0g Features See-through & Screw case back