Press on the main alarm screen to toggle the daily alarm and the hourly time signal on or off. 2. Countdown Timer Mode
Press the large Front (G) button below the screen at any time to activate the famous G-Shock display light. Casio G Shock Dw 6600 Instructions
While any digit is flashing, pressing the Top Right (B) button toggles between regular 12-hour and 24-hour (military) time formats. Press on the main alarm screen to toggle