Movement type: NH35 automatic mechanical movement (two-way automatic winding) Movement features: 3 hands/calendar, frequency 21,600 times per hour (3Hz), stop-second device, two-way automatic winding, 24 stone, 41 hours of energy storage. Case material: 316L stainless steel Case process: sanding, polishing Bottom cover type: screw-in solid bottom cover Case diameter: 45.40mm (without crown) Case length: 54.85mm (total length from top to bottom) Case thickness: 17.10mm (including table mirror and bottom cover) Case ear position: 22mm (the place where the case and the strap are connected) Whole Watch weight: 258g (including steel strap) Watch length: 260mm (total length of the watch/circumference) Watch mirror material: anti-dazzling blue coating, double bu artificial synthetic sapphire Crown type: screw-in Bezel material: ceramic Bezel features: 120 teeth single rotation Waterproof level: 1000 meters waterproof / diving [can wash hands, swim, dive, meet all daily waterproof use] Exhaust valve: Yes