2100 series Resin and stainless steel composition Adjustable resin band Shock-resistant construction 200-meter water resistance Approx. battery life: 3 years on SR726W X 2 Mineral glass World time - 31 time zones 1/100-second stopwatch Countdown timer Double LED light Full auto-calendar Button operation tone on/off 12/24-hour format Size: H 0.46 x W 1.748 x L 1.94 in Weight: 72 g   Style: gm2100tttr-8a Material: Resin / Stainless steel