Boldly daring, this sporty watch conveys maximum info at a glance. This 1/20 second chrono measures to 60 minutes, with perpetual calendar, 12/24 hour time, dual time, alarm, and rotating inner ring. Features include an oversized 48mm stainless steel case with screw-back, and is 100M WR. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E820.