In addition to the current time, the G-SHOCK also offers you many exciting functions. It has a timer with a capacity of up to 24 hours. You can also stop the time down to the second thanks to a practical stopwatch function. The watch has an alarm function to wake you in the morning or remind you of important events during the day. You can save up to five daytime alerts.

Design meets functionality

The modern design of the impact-resistant G-SHOCK makes the watch a stylish accessory that will enhance your look. You can choose to have the time displayed in a 12-hour or 24-hour format. An automatic calendar reliably displays the date together with weekday and month and is easy to read at any time thanks to LED backlighting.


  • Size (ø): 46 mm
  • Strap length: 215 mm
  • Strap width: 26 mm
  • Weight: 50 g
  • Material: carbon-reinforced resin (case) / resin (strap)
  • Colour: black


  • Quartz movement
  • Timer
  • Stopwatch function
  • World time function
  • Five daily alarms
  • Automatic calendar
  • Hand Moving function
  • Neo-display
  • Shockproof
  • Waterproof to 20 bar*
  • Analogue/Digital
  • Pin buckle

Included in delivery

  • CASIO G-SHOCK GA-2100-1 A1 ER Watch

*The case is waterproof to 20 bar and therefore suitable for use in the shower or bath or when swimming or scuba diving.