Casio 3554 Operation Manual page 89

Viewing the Face in the Dark
The watch has a light that illuminates the face
for viewing in the dark.
The light turns on each time you perform a
●
button operation.
Illumination is turned on when the sounds or
●
vibrations start by Auto Lap, notification or
alarm etc. Illumination that is turned on by a
notification operation cannot be turned off.
To illuminate the face manually
●
Press (B) to turn on illumination.
Illumination will turn off automatically if an
●
alarm starts to sound.
Using Auto Light
●
If Auto Light is enabled, face illumination will
turn on automatically whenever the watch is
positioned at an angle of 40 degrees or more.
For information about enabling Auto Light, see
the information below.
Configuring the Auto Light Setting
l
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.
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.
Watch Operation Guide 3554
Note
If Auto Light is enabled, face
●
illumination may be delayed if you
angle the watch towards your face
while a compass, altitude, barometric
pressure, or temperature reading
operation is being performed.
Fastening the Watch to Your
Wrist
Correctly wearing the watch on your wrist is
essential to obtain accurate heart rate,
breathing exercise, and sleep measurements.
Especially when using the watch while running
or performing other strenuous exercises,
make the adjustments described below to
ensure that the watch does not shake or shift.
1.
With the watch fastened loosely on your
wrist, place at least one finger to the right
of the watch* (Figure).
* If you wear the watch on your right wrist,
place your finger(s) to the left of the (C)
button (left side of the watch).
Figure
40
degrees
or more
2.
Position the watch so there is at least one
finger width between it and the bone that
protrudes from the side of your wrist
(Figure).
The location and shape of this bone
●
(circled in the illustration) differ from
person to person.
3.
After you determine the best wrist position
for the watch, tighten the band securely
enough to keep the watch from sliding on
your wrist.
Important!
A band that is snugly tightened for
●
heart rate or other measurements can
make it difficult for air to pass under the
band and cause you to sweat, which
can lead to skin irritation. After
measuring your heart rate, loosen the
band enough so you can insert a finger
between it and your wrist.
Wearing the watch for long periods,
●
sweat, or certain usage environments
create the risk of skin rash. To prevent
skin problems, regularly remove your
watch from your wrist to give your skin
some time to rest.
The watch is not fastened correctly to
●
your wrist if you can see green light
coming out from behind the watch.
Keep your arms still during breathing
●
exercise measurement.
For details about how to wear the
●
watch during blood oxygen level
measurements, see the information
below.
Measuring Your Blood Oxygen
l
Level
89