2100 Series  Resin and stainless steel composition Analog-digital dial Tough solar powered Mineral glass Shock resistant construction 200-meter water resistance Wireless linking using bluetooth Approx battery life: 3 years on SR726W X 2 World time zones Stopwatch, timer, alarm, and hourly time signal Full auto-calendar Double LED light Mute feature with button operation on off-tone Size: H 0.46 x W 1.74 x D 1.94 in Weight: 72 grams   Style: gbm2100a-1a3 Material: Resin / Stainless Steel