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Important!
Auto Light may not operate properly
when the watch is at a horizontal angle
of 15 degrees or greater from
horizontal as shown in the illustration
below.
Auto Light may operate unintentionally
and run down the battery if the watch
is blocked from light by your sleeve.
Electro-static charge or magnetism
can interfere with proper auto light
operation. If this happens, try lowering
your arm and then angle it towards
your face again.
When moving the watch you may note
a slight rattling sound. This is due to
operation of the auto light switch,
which determines the current
orientation of the watch. It does not
indicate malfunction.
Note
Auto Light is disabled when any one of
the conditions below exists.
ー 
Alarm, timer alert, or other beeper
sounding
ー 
Time calibration reception in
progress
Configuring the Auto Light Setting
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (B) for at least three seconds
to toggle Auto Light between enabled and
disabled.
[LT] is displayed while Auto Light is
enabled.
On
Note
Auto Light is disabled while [CHG] is
shown on the display.
Specifying the Illumination Duration
You can select either two seconds or four
seconds as the illumination duration.
1. Enter the Timekeeping Mode.
l
Navigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the name of the
currently selected Home City appears on
the display.
Home City
3. Press (C) 12 times to display [LIGHT].
4. Press (D) to select an illumination
duration.
[2]: 2-second illumination
[4]: 4-second illumination
5. Press (A) to exit the setting screen.
Useful Features
Pairing the watch with your phone makes a
number of the watch’s features easier to use.
Auto time adjustment
l
Auto Time Adjustment
12:30
Selection of More Than 300 World Time
cities
l
Configuring World Time Settings
Recording of Anniversaries and
Appointments
l
Configuring Reminder Settings
In addition, a number of other watch settings
can be configured using your phone.
To transfer data to a watch and to
configure settings, you first need to pair
the watch with your phone.
l
Getting Ready
Your phone needs to have the CASIO
“CASIO WATCHES” app installed to pair
with the watch.
Watch Operation Guide 3501
9
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