Case Shape: Round Dial Window; Dial window material type: Sapphire Crystal; Clasp: Push Button Hidden Clasp; Case diameter: 41mm; Case Thickness: 11mm; Band Width: 20mm; Band Material Type: Stainless Steel; Model Number: Oupinke 3168. No Battery Required! Supports Self-winding via Everyday Hand Motions or Manual Winding with an 80-hour Kinetic Energy Reserve. Automatic Male Watches, Wearing Different Fashion, Creative Design Is More Playable And Enjoyable. Original Mechanical Movement, High-quality Craftsmanship, Skeleton Watch Specially Designed For Men. Sealed Waterproof Sapphire Mirror, Wear & Scratch Resistant, Can Swim, Bathe In Cold Water But Can Not Dive. Tungsten Steel Band, Scratch Resistant, Metallic Luster, Comfortable To Wear, Highlighting The Charm Of Men. Design Patent, Good Quality, Time Will Tell. Best Gift for Friends/Family/Lover/Yourself with Exquisite Box. src="">