• Battery life: 18 months Function Brief:Compass, Altimeter,Barometer , Thermometer,Weather Forecast, World Time,Dual Time,Pedometer, calorie, distance record,2 sets alarm,Countdown timer ,Stopwatch, EL Backlight.
• Materials: Solid metal case with durable and breathable nylon band(1set extra silicone band for exchange ) ,Japenese battery. (CR2032 18months life).
• Watch Size: Diameter: 50mm/1.97in; thickness: 16mm/0.63in; width of band: 24mm/0.94in; net weight: 117g/4.12oz.（since it is a little big and heavy ,please kindly check if it meet your needs)
• Waterproof: 50M waterproof, means you could wearing it for swimming (not diving), don't push the button when it is under water, also do not wearing it for hot water bath, it will reduce its life span.
• Package Include: Watch X1; manual X1, extra silicone band X1, packed in a black square gift box.