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. The 48mm stainless steel rose gold-tone case with screw-back complements the rich brown leather strap with white contrast stitching, and is 100M WR. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E820. Rose gold-tone watch with tile pattern on bezel and leather strap with contrast stiching;Eco-Drive is fueled by light so it never needs a battery;Chronograph subdials with 12/24-hour time, 1/20-second time, and alarm;Features protective mineral quartz dial window, buckle closure, leather band, and luminous hands/hour markers;Water-resistant to 100 m (330 ft)