Features: stainless steel case stainless steel bracelet swiss automatic movement caliber: valjoux a05.H31 27 jewels scratch-resistant sapphire crystal with antireflective coating blue dial analog display power reserve up to 60 hours chronograph function interchangeable quick release bracelet luminous hands and markers date display see through case back deployment clasp 100m water resistance approximate case diameter: 42mm approximate case thickness: 14.5mm approximate lug width: 13mm