Features: stainless steel case stainless steel bracelet automatic movement caliber: 4r36 hardlex crystal 24 jewels blue/black dial analog display power reserve accuracy: +45 to -35 seconds per day luminous hands and markers day and date display unidirectional rotating bezel screw down crown see through case back push button deployment clasp 200m water resistance approximate case diameter: 45mm approximate case thickness: 13mm