Casio General x Digital ft. Lightweight Army Unisex Casual Hexagon Water Resistant Watch F-91WS-7A2 F91WS F91 F-91 F-91WS Rediscover a digital icon with the Casio F-91WS series, a revival of the classic F-91W. These lightweight timepieces feature a modern resin case paired with a translucent resin strap. Powered by the legendary module 593, they offer reliable quartz accuracy and an impressive 7-year battery life - all with 30-meter water resistance. Module / Movement 593 (quartz) Battery Life / Accuracy Approximately 7 years (+/-30 seconds per month) Crystal Resin glass Light LED light Case / Band Material Resin case with resin band Water Resistance Water resistant Case Size Thickness: 8.5 mm Diameter: 35.2 mm Length: 38.2 mm Lug width: Integrated Other Specifications Casio General x Digital ft. Lightweight Army 1/100-second stopwatch (up to 60 minutes, elapsed time, split time) Daily alarm Hourly time signal Auto-calendar (set at 28 days for February) 12/24-hour format Regular timekeeping (digital display)