Movement type: Japanese NH35 automatic mechanical movement 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 Bottom cover type: screw-in bottom cover Case diameter: 41.2mm (without crown) Case length: 46mm (total length from top to bottom) Case thickness: 13.5mm (including table mirror and bottom cover) Case Lugs position: 22mm (the place where the case and the strap are connected) Watch length: 250mm (the total length of the watch/circumference) Watch mirror material: synthetic sapphire Crown type: screw-in Bezel material: ceramic ring Bezel features: 120 tooth ring unidirectional rotation Bezel Luminous: C3 super luminous powder, glowing green Waterproof level: 200 meters waterproof / diving [can wash hands, swim, dive, meet all daily waterproof use]