"Stainless Steel with Black Ion Plating Eco-Drive Solar Power - Never needs a battery Perpetual Calendar 1/20 Second Chronograph Measures up to 60 Minutes 12/24 Hour Time Dual Time Alarm Tachymeter Date Window at the 4 o'clock position 120 Day Power Reserve with, 270 Days with Power Saver with a full charge (43 hours under a light for a full charge) Mineral Glass Crystal Water Resistant to 200 Meters (660 Feet) Bracelet features a Fold Over Safety Clasp with Push Button Release 43mm Case Width (Approximately 1 11/16"")"