Specification Seamless single block 316L stainless steel Anti-reflective sapphire crystal Screw-in case back Screw-down crown Diameter: 40mm Thickness: 7.65mm Water resistance: 5ATM / 165ft. Hypo-allergenic, food grade silicon rubber Detachable design for easy cleansing & total disinfection strap Movement Swiss Ronda 715 Function Hour, minute, second, date Warranty International warranty for three years from date of purchase