Product parameters Movement type: quartz movement Movement model: Miyota 2115, Japan Movement function: 3-pin/calendar, Japanese original battery, long battery life of 4 years Battery model: SR626SW Case material: 316L stainless steel Case process: wire drawing + polishing Bottom cover material: 316L stainless steel Bottom cover type: screw-in solid bottom cover Case diameter: 41mm (excluding head) Case length: 48mm (total length from top to bottom) Shell thickness: 13mm (including lens and bottom cover) Case ear position: 20mm (the position where the case and the strap are connected) Watch weight: 163g (including steel strap) Watch length: 228mm (total watch length/circumference) Strap material: stainless steel / rubber strap / nylon Table mirror material: mineral glass Table mirror type: convex crystal mineral glass Mirror mirror coating: anti-glare blue coating Mirror size: 30.5*2.5mm (diameter * thickness) Crown type: screw-in screw crown Crown size: 7.00mm (diameter) Bezel material: ceramic Baffle function: one-way rotation Luminous bezel: 240,000 / KG Swiss BGW9 super luminous powder, blue light Frame size: 37.98 * 30.60 * 2.00mm (outer diameter * inner diameter * thickness) Surface color: black/green/blue Surface luminescence: 240,000 / KG Swiss BGW9 super luminous powder, green light Surface size: 29.50 * 29.00 * 29.00 * 0.4mm (line hole * surface diameter * opening surface * thickness) Hand craft: polished and electroplated white steel C3 with green luminous Dial Luminous: 240,000 / KG Swiss C3 super bright powder, glowing green Hand size: 7*11*11 (hour hand * minute hand * second hand length) Waterproof rating: 200 meters waterproof/diving [can wash hands, swim, dive, meet all daily waterproof requirements] Exhaust valve: none Warranty period: three years free warranty Packaging standard: professional waterproof plastic box packaging