Casio module 3403

1. In the Timekeeping Mode, hold A for about two seconds until SET Hold shows and the time zone screen appears.
2. Press C to step through the settings: time zone, summer time, 12/24-hour format, seconds, hour, minutes, year, month, day, then button tone, light duration and alert method.
3. On the seconds, press D to reset them to 00.
4. On the hour, minutes, year, month or day, use B and D to change the value (hold for fast).
5. On the 12/24-hour format, press D to switch.
6. Press A to go back to the Timekeeping Mode.

From Casio's guide, page E-15

1. In the Timekeeping Mode, hold A for about two seconds until the time zone screen appears.
2. Press C once to reach the summer time setting.
3. Press D to switch it on or off.
4. Press A to go back. The DST indicator shows while summer time is on.

From Casio's guide, page E-18

1. In the Timekeeping Mode, hold A for about two seconds until the time zone screen appears.
2. Use B and D to choose the time zone of the city where you use the watch.
3. Press A to go back to the Timekeeping Mode.

From Casio's guide, page E-15

1. Press C twice from the Timekeeping Mode to reach the Alarm Mode.
2. Press D to pick an alarm (Alarm 1 to 4, snooze alarm, or hourly time signal).
3. Press B to choose how it sounds: off, once, or every day (snooze alarm: off or on).
4. Hold A for about two seconds until the hour digits flash.
5. Use B and D to set the value, and C to move between hour and minutes.
6. Press A to leave the setting screen.

From Casio's guide, page E-26

1. Press L to light the display.
2. In the Timekeeping Mode, hold L for at least three seconds to turn Auto Light on or off.
3. To change the duration, hold A in the Timekeeping Mode until the time zone screen appears, press C 10 times, then press D to choose LT1, LT3 or LT5.
4. Press A to go back.

From Casio's guide, page E-46

1. In the Timekeeping Mode, hold A for about two seconds until the time zone screen appears.
2. Press C nine times: the screen shows KEY♪ or MUTE.
3. Press D to switch, then A to go back.

From Casio's guide, page E-42

1. Press C three times from the Timekeeping Mode to reach the Stopwatch Mode.
2. Press D to start, D to stop, and D again to carry on.
3. When it is stopped, press B to reset it.
4. For a split time, press B while it runs (SPLIT flashes); press B again to cancel the split display.

From Casio's guide, page E-32

1. Press C four times from the Timekeeping Mode to reach the Timer Mode.
2. Hold A for about two seconds until the hours flash.
3. Press C to move between hours, minutes and seconds, and use B and D to change them.
4. Press A to leave the setting screen.
5. Press D to start and stop the countdown; when it is stopped, press B to reset it.

From Casio's guide, page E-36