Operation Guide 2816
Dual Time
The Dual Time Mode lets you keep track of time in aBattery Power Indicator
Dual time
(Hour : Minutes Seconds)different time zone.The battery power indicator on the display shows you the current status of the
" The seconds count of the Dual Time is synchronizedrechargeable batteryOs power.
with the seconds count of the Timekeeping Mode.
Battery power indicatorLevelBattery PowerFunction Status
To set the Dual TimeIndicator
1.Press C to enter the Dual Time Mode.
2.Use A, B, and D to set the Dual Time Mode time.1All functions enabled.
" Each press of D (+) and B (�) changes the time
setting in 30-minute increments.2All functions enabled.
Timekeeping Mode time
" Pressing A sets the Dual Time Mode to the same time
as the Timekeeping Mode.3|||||||||Beeper tone, backlight,
|||||||display, and buttons are
(Charge Soon Alert)disabled.
Backlight
4All functions, including
The backlight uses an EL (electro-luminescent) panel thattimekeeping, are disabled.
Auto light switchcauses the entire display to glow for easy reading in the
on indicatordark. The watchOs auto light switch automatically turns on
" The flashing indicator at Level 3 tells you that battery power is very low, and
the backlight when you angle the watch towards your face.that exposure to bright light for charging is required as soon as possible.
" The auto light switch must be turned on (indicated by" At Level 4, all functions are disabled and settings return to their initial factory
the auto light switch on indicator) for it to operate.
defaults. Functions are enabled once again after the rechargeable battery is
" See OBacklight Precautions� for other importantcharged, but you need to set the time, date, and all other settings after the battery is
information about using the backlight.recharged to Level 2 from Level 4. Though the time appears on the display after the
To turn on the backlight manuallybattery is charged to Level 3, you will not be able to change the time setting until the
In any mode, press L to illuminate the display for aboutbattery reaches Level 2.
one second." Leaving the watch in direct sunlight or some other very strong light source can
" The above operation turns on the backlight regardless ofcause the battery power indicator to temporarily show a reading that is higher than
the current auto light switch setting.the actual battery level. The correct battery power indicator should appear after a
few minutes.
About the Auto Light Switch" If you use the backlight or any of the alarm functions a number of times during a
Turning on the auto light switch causes the backlight to turn on for about one second,short period, RECOVER appears on the display and the following operations
whenever you position your wrist as described below in any mode. Note that thisbecome disabled until battery power recovers.
watch features a OFull Auto EL Light�, so the auto light switch operates only whenBacklight
available light is below a certain level. It does not turn on the backlight under brightBeeper tone
light.After some time, battery power will recover and RECOVER will disappear, indicating
that the above functions are enabled again.
Moving the watch to a position that is parallel to the ground and then tilting it towards
Charging Precautions
you more than 40 degrees causes the backlight to turn on.
Certain charging conditions can cause the watch to become very hot. Avoid leaving
the watch in the areas described below whenever charging its rechargeable battery.
Also note that allowing the watch to become very hot can cause its liquid crystal
Parallel toMore thandisplay to black out. The appearance of the LCD should become normal again when
ground40!the watch returns to a lower temperature.
Warning!
Leaving the watch in bright light to charge its rechargeable battery can cause it
to become quite hot. Take care when handling the watch to avoid burn injury.
The watch can become particularly hot when exposed to the following
conditions for long periods.
Warning!
" On the dashboard of a car parked in direct sunlight
" Always make sure you are in a safe place whenever you are reading the" Too close to an incandescent lamp
display of the watch using the auto light switch. Be especially careful when
" Under direct sunlight
running or engaged in any other activity that can result in accident or injury.
Also take care that sudden illumination by the auto light switch does notCharging Guide
surprise or distract others around you.After a full charge, timekeeping remains enabled for up to about 11 months.
" When you are wearing the watch, make sure that its auto light switch is turned" The following table shows the amount of time the watch needs to be exposed to light
off before riding on a bicycle or operating a motorcycle or any other motoreach day in order to generate enough power for normal daily operations.
vehicle. Sudden and unintended operation of the auto light switch can create a
distraction, which can result in a traffic accident and serious personal injury.Exposure Level (Brightness)Approximate Exposure Time
Outdoor Sunlight (50,000 lux)5 minutes
To turn the auto light switch on and off
In the Timekeeping Mode, hold down D for about two seconds to toggle the auto lightSunlight Through a Window (10,000 lux)24 minutes
switch on (auto light switch on indicator displayed) and off (auto light switch onDaylight Through a Window on a Cloudy Day48 minutes
indicator not displayed).
(5,000 lux)
" The auto light switch on indicator is on the display in all modes while the auto light
switch is turned on.Indoor Fluorescent Lighting (500 lux)8 hours
" Since these are the specs, we can include all the technical details.
Battery" Watch is not exposed to light
" Internal timekeeping
This watch is equipped with a solar cell and a rechargeable battery (secondary" Display on 18 hours per day, sleep state 6 hours per day
battery) that is charged by the electrical power produced by the solar cell. The" 1 backlight operation (1.5 seconds) per day
illustration shown below shows how you should position the watch for charging." 10 seconds of alarm operation per day
" 1 hour of calorie measurement per day (one 5-second beeper per day and one
Example: Orient the watch so its5-second beeper per week when the calorie targets are reached)
face is pointing at a light source.Solar cell" Stable operation is promoted by frequent charging.
" Note that charging efficiency
drops when any part of the solarRecovery Times
cell is blocked by clothing, etc.The table below shows the amount exposure that is required to take the battery from
" The illustration shows how toone level to the next.
position a watch with a resin band.
Exposure LevelApproximate Exposure Time
Important!(Brightness)
" Storing the watch for long periods in an area where there is no light or wearing it inLevel 4Level 3Level 2Level 1
such a way that it is blocked from exposure to light can cause rechargeable battery
power to run down. Be sure that the watch is normally exposed to bright lightOutdoor Sunlight (50,000 lux)2 hours 24 hours 7 hours
whenever possible.
" This watch employs a solar cell that converts light into electricity, which charges aSunlight Through a Window 7 hours120 hours33 hours
built-in rechargeable battery. Normally, the rechargeable battery should not need(10,000 lux)
replacement, but after very long use over a number of years, the rechargeableDaylight Through a Window
battery may lose its ability to achieve a full charge. Should you notice problems withon a Cloudy Day (5,000 lux) 10 hours243 hours67 hours
getting the rechargeable battery to a full charge, contact your dealer or CASIO
distributor about having the rechargeable battery replaced.Indoor Fluorescent Lighting118 hours� � �
" The rechargeable battery should be replaced with a CASIO-specified CTL1616(500 lux)
battery only. Other rechargeable batteries can cause damage to the watch.
" The above exposure time values are all for reference only. Actual required exposure
" All data stored in memory is deleted, and the current time and all other settingstimes depend on lighting conditions.
return to their initial factory defaults whenever battery power drops to Level 4 and
when you have the battery replaced.
" Turn on the watchOs Power Saving function and keep it in an area normally exposed
to bright light when storing it for long periods. This helps to keep the rechargeable
battery from going dead.
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ACEC
CASIO
