Features: stainless steel case stainless steel bracelet caliber v172 powered by both natural and artificial light power reserve up to 6 months no battery change required hardlex crystal chronograph - measures up to 60 minutes in 1/5 second increments alarm function split time measurement black dial with tachymeter scale luminous hands and indices blackened bezel, crown and pushers date window at 3 o'clock position three fold clasp with push button release screw-in case back 100m water resistance case diameter 43mm case thickness 12mm