GBX-100 Series  Resin and stainless steel composition World time 1/100-second stopwatch 4 daily alarms Hourly time signal Button operation tone on/off 12/24-hour format Mineral glass Resin band Shock resistant 200-meter water resistance Battery life: 2 years approx on CR2032 Smartphone link feature through Bluetooth and Apps Phone finder Dial size: L 2.00 × W 1.81 × H 0.58 in Weight: 66 grams   Style: gbx100-8 Material: Resin / Stainless Steel