Classic digital stopwatch technology meets the twenty-first century with the highly accurate, Bluetooth 4.0-connected Runner from Casio. This watch links to your mobile phone to exchange information and keep you connected at all times. Bluetooth 4.0 Brand: Casio Dial Color: Gray Strap: Black resin Clasp: Buckle Movement: Quartz Water Resistance: 100m Case Width: 47mm Case Thickness: 15½mm Bracelet Dimensions: 8” long, 26mm wide Model No.: STB270-1 Special Features: gray dial, black resin strap, alarm function, day and date display, stopwatch and chronograph functions, Bluetooth 4.0 low energy data connection, world time display, countdown timer, mobile link, vibration alert, fully automatic calendar, 10 ATM water resistance Jewelry photos are enlarged to show detail.