This is for the serious guy considering time a valued possession whether it’s in another country or in the outdoors. So the alarm joined the diver’s-style minus the battery-changing ordeal. That’s the beauty of the Eco Drive Caliber E820. And the low-charge indicator ensures you are never short of power when extensive and simultaneous use of the chronograph, the dual-time and alarm functions are necessary. Features: Stainless Steel Case Stainless Steel Bracelet Caliber E820 Eco Drive Technology (Charges In Sunlight Or Indoors, No Batteries To Change) Mineral Glass With Non Reflective Coating Black Dial Perpetual Calendar 1/20 Sec Chronograph Up to 60 min Dual Time Function 12/24 Hours Time Display Date Window At The 4 O'Clock Position Fold-Over Clasp With Double Push Button Safety Low Charge Indicator Luminous Hands And Markers Unidirectional Rotating Elapsed Time Bezel Alarm Function 100m Water Resistant Case Diameter 44mm Case Thickness 12mm