Movement type:PT5000 automatic mechanical movement Movement characteristics: 3 hands / calendar, frequency 21,600 times per hour (3Hz), stop seconds device, two-way automatic winding, 24 stones, 41 hours of energy storage. Case material: CUSN8    Bottom cover material:316L stainless steel  Bottom cover type: screw-in bottom cover Case diameter: 41mm (without bar) Case length: 50mm (total length from top to bottom) Case thickness: 12.5mm (including table mirror and bottom cover) Case ear position: 22mm (the link between case and strap) Watch mirror material: synthetic sapphire Watch mirror type:  shapphire glass  Watch mirror coating: anti-glare blue coating Bar head type: screw-in screw lock bar   Waterproof level: 200 meters waterproof / diving [can wash hands, swim, dive, to meet all daily waterproof use]