Resin composition Adjustable band Shock-resistant construction 200-meter water resistance Wireless Bluetooth connectivity Approx. battery life: 3 years on CR2025 Step count using a 3-axis acceleration sensor Approximately 300 world time cities Mineral glass 1/100-second stopwatch Countdown timer LED backlight for super illuminator Full auto-calendar Button operation tone on/off 12/24-hour format Size: H 0.61 x W 1.91 x L 2.13 in  Weight: 59 g   Style: gbd800uc-8 Material: Resin