Casio LDF-52-1A Ladies Black Poptone Digital Watch Imported 50M Water Resistant, EL Backlight, Dual time 1/100 second stopwatch, Daily alarm, Hourly time signal Full auto-calendar (pre-programmed until the year 2099), 12/24 hour formats Accuracy: +/-20 seconds per month, Battery: CR1216, Approx. battery life: 3 years Module: 3171, Size of case / total weight: 46.7 x 23.6 x 11.4mm / 25.0g