[Size/Weight] Case size: Height 47.0 x Width (including crown guard) 42.2 x Thickness 11.7 (approx. mm), Bezel diameter: approx. 40 mm, Belt: width approx. 18 (buckle side) ~ 20 (case side) mm , lug width approx. 20mm, arm circumference length (longest): approx. 190mm, mass: approx. 129g [Material] Case: Stainless steel, Belt: Stainless steel, Windshield: Hardlex crystal [Waterproof performance] Reinforced waterproof for daily life (10 ATM water resistant) [Movement] Cal. 8T63 quartz, 1/5 second chronograph (60 minute meter), with 24 hour hand [Accessories] Cosmetic box, warranty card (*all genuine Seiko products) *From February 2024, as part of SEIKO's efforts to address environmental issues (going paperless), products will no longer come with instructions. Please view it using the method described in the attached manufacturer's warranty. [Main specifications] ●Caliber No.: 8T63 ●Drive system: Quartz ●1/5 second chronograph (60 minute meter) ●24 hour hand included ●Accuracy: ±15 seconds per month ●Case material: Stainless steel ●Glass material: Hard Rex Crystal ●Waterproofing: Reinforced waterproofing for daily life (10 ATM) ●Other features: Screw back (Due to manufacturing reasons, there are individual differences in the orientation of the back cover) ●Other features: Calendar (date) function included