Built with the shock-resistant design that G-Shock is famous for. Silicone band with metal buckle. 200M water resistance. Alpha Gel®. Auto LED backlight with Afterglow. Flash flood alert. 29 times zones (48 cities), city code display, daylight savings. 3 multi-functional alarms. Hourly signal. 1/100 second stopwatch. Countdown timer:Measuring unit: 1 second.Range: 1 minute to 24 hours. Pre-programmed calendar until the year 2099. 12/24 hour format. Button tone on/off. Accuracy +/- 15 seconds a month. Battery: CR2032 (10 year battery life). Module: 3420.