2100 series Carbon and bio-based resin Bio-based resin band Mineral glass Shock resistant Carbon core guard structure 200-meter water resistance Approx. battery life: 3 years World time of 31 time zones 1/100-second stopwatch Countdown timer 5 daily alarms Hourly time signal Double LED light Full auto-calendar (to year 2099) Button operation tone on/off Accuracy: ±15 seconds per month 12/24-hour format Dimensions: L 1.91" x W 1.79" x H 0.46" Compatible band size of up to 8.46" Style: gskga2100rl-1a Color: Black Material: Carbon / Bio-based Resin