2100 series  Resin and stainless steel composition World time 1/100-second stopwatch 5 daily alarms Hourly time signal Button operation tone on/off 12/24-hour format Mineral glass Resin band Shock resistant 200-meter water resistance Metal bezel ion-plated in gold Battery life: 3 years approx on SR726W X 2   Dial size: L 49.3 × W 44.4 × H 11.8 mm Weight: 72 grams   Style: gm2100g-1a9 Material: Resin / Stainless steel