Take things up a notch with this dramatic yet sporty look. This perpetual calendar is loaded with features including a 1/20 second chronograph that measures up to 60 minutes, 12/24 hour time, dual time, date, alarm, and luminous hands. Shown in stainless steel 44mm screw-back case and brown leather strap , it is also 100M WR. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E820.