Case Shape: Round Dial Window; Dial window material type: Sapphire Crystal; Clasp: Push Button Hidden Clasp; Case diameter: 40mm; Case Thickness: 12mm; Band Width: 20mm; Band Material Type: Tungsten & Stainless Steel. No battery required! Supports self-winding via everyday hand motions or manual winding with an 80-hour kinetic energy reserve. Classic and fashionable style: This blue mens wristwatch can match any clothes and appear on any occasion. It will not only add a pop of color on your wrist, it will also show an incredible amount of depth when the light hits it, almost creating something new all together. 50m waterproof: Nano-level sealed waterproof, can withstand hand washing, face washing, swimming, and cold bathing. Synthetic sapphire crystal: Mohs level 9 hardness, upgraded scratch-resistant coating, anti-corrosion, anti-fingerprint, bright and clean. High-quality movement: Adopts imported automatic mechanical movement, inherits superb craftsmanship, and can run stably. Luminous: High-gloss luminous powder, the cost is 20 times that of the normal luminous, and the light is longer. Any light source charges the luminous display in about 30 seconds so that you can clearly tell the time in the dark. Tungsten steel strap: Using high-gloss cutting technology, differentiated diamond-shaped staggered layout strap, wear-resistant and scratch-resistant. Best gift for friends/family/lover/yourself with exquisite box. src="">