G-Shock GW-1800DJ-1A9 - Manual (Page 38)

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To turn the Daily alarm and the Hourly Time Signal on and off
In the Alarm Mode, press D to cycle through the settings shown below.
• The alarm on indicator (when the alarm is on) and the hourly time signal on indicator
(when the hourly time signal is on) are displayed in the lower display in all modes.
Alarm Off
Signal Off Alarm On
Signal Off Alarm Off
Signal On Alarm On
Signal On