Casio 3511 User manual

Operation Guide 3511
EN-9
Timer Mode Alarm Mode
C
C
Dual Time Mode C
You can also find
information about
operational procedures
at the CASIO website.
https://support.casio.
com/global/en/wat/
model/3511/
EN-8
Selecting a Mode
xPress Cto change from mode to mode.
xIn any mode (except when a setting screen is on the display), press Bto illuminate
the face of the watch.
Stopwatch ModeTimekeeping Mode Recall Mode
C C C
EN-7EN-6
Watch Features
You can also find information
about operational procedures
at the CASIO website.
https://support.casio.com/
global/en/wat/model/3511/
◆Stopwatch
◆Timer
◆Alarm
◆Dual Time
EN-5
Illumination........................................................................................................ EN-47
To illuminate the display.................................................................................EN-47
To specify the illumination duration ...............................................................EN-48
Reference .......................................................................................................... EN-49
To turn the button operation tone on and off.................................................EN-50
Specifications ................................................................................................... EN-52
EN-4
Recall Mode ...................................................................................................... EN-28
To recall stopwatch time records...................................................................EN-29
To delete a log ...............................................................................................EN-31
Timer.................................................................................................................. EN-32
To use the countdown timer ..........................................................................EN-33
To configure countdown start time and auto-repeat settings........................EN-34
Alarm.................................................................................................................. EN-36
To set an alarm time.......................................................................................EN-38
To test the alarm ............................................................................................EN-40
To select the operation of Alarm 1.................................................................EN-41
To turn Alarms 2and 3on and off .................................................................EN-42
To turn the hourly time signal on and off .......................................................EN-43
Dual Time .......................................................................................................... EN-44
To set the Dual Time ......................................................................................EN-44
EN-3
Contents
About This Manual.............................................................................................. EN-2
Watch Features................................................................................................... EN-6
Selecting a Mode................................................................................................ EN-8
Timekeeping...................................................................................................... EN-10
To set the time and date ................................................................................EN-11
To toggle between 12-hour and 24-hour timekeeping ..................................EN-13
To toggle the Timekeeping Mode between DST and Standard Time............EN-14
Stopwatch ......................................................................................................... EN-15
To measure elapsed time...............................................................................EN-19
To measure elapsed time with lap times........................................................EN-20
To measure elapsed time with split times......................................................EN-23
To time first and second place finishes..........................................................EN-25
EN-2
About This Manual
xDepending on the model of your watch, display text
appears either as dark figures on a light background, or
light figures on a dark background. All sample displays
in this manual are shown using dark figures on a light
background.
xButton operations are indicated using the letters shown in the illustration.
xEach section of this manual provides you with the information you need to perform
operations in each mode. Further details and technical information can be found in
the “Reference” section.
EN-1
ENGLISH
You can also find information about
operational procedures at the CASIO website.
https://support.casio.com/global/en/wat/model/3511/
MA2111-EA © 2022 CASIO COMPUTER CO., LTD.

Operation Guide 3511
EN-19
To measure elapsed time
Note
xYou can perform the following steps starting from either the lap time screen or the
split time screen.
1. Press Dto start the stopwatch.
2. Press Dagain to stop the stopwatch.
xYou can resume the measurement operation by pressing D.
3. Press Eto clear the stopwatch to all zeros.
EN-18
Seconds
More than 10 hours
More than one hour
Minutes
Seconds
1/100 second
Hours
Minutes 1/100 second
Hours
Minutes
Seconds
Hours Minutes
Seconds
EN-17
xSee “To measure elapsed time with lap times” (page EN-20) and “To measure
elapsed time with split times” (page EN-23) for more information about each type of
measurement.
xYou can perform elapsed time measurement starting from either the lap time
screen or the split time screen (pages EN-20 and EN-23). Whenever you enter the
Stopwatch Mode, the screen (lap time or split time) that was displayed when you
last exited the mode will appear first.
xDuring a stopwatch elapsed time operation, the upper display initially shows
minutes, seconds, and a 1/100-second value. This changes to hours, minutes, and
seconds when the time in the upper display exceeds 60 minutes.
xThe lower display initially shows hours, minutes, seconds, and a 1/100-second
value. This changes to hours, minutes, and seconds when the time in the lower
display exceeds 10 hours.
EN-16
xThe stopwatch measurement operation continues even if you exit the Stopwatch
Mode.
xFor information about how stopwatch times are stored in memory, see “Memory
Management” (page EN-26).
Viewing the Stopwatch Displays
The information that appears in the watch’s upper and lower displays depends on
whether you are measuring lap times or split times.
Lap Time Measurement
Upper Display: Lap time
Lower Display: Elapsed time
Split Time Measurement
Upper Display: Lap time
Lower Display: Elapsed time (Split time appears here for eight seconds as it is stored
in memory.)
EN-15
Stopwatch
The stopwatch lets you measure elapsed time, lap times,
split times, and two finishes. Lap times and split times
can be stored in memory.
xThe display range of the stopwatch is 99hours,
59minutes, 59seconds.
xAll of the operations in this section are performed in
the Stopwatch Mode, which you enter by pressing C
(page EN-8).
Note
x“Lap time” is the time spent to cover a specific
segment of a race, such as one lap around a track.
“Split time” is the time spent from the beginning of a
race up to a certain point.
xThe stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
Remaining free records
1/100 secondHours
Minutes Seconds
EN-14
Daylight Saving Time (DST) Setting
Daylight Saving Time (summer time) advances the time setting by one hour from
Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.
To toggle the Timekeeping Mode between DST and Standard Time
1. In the Timekeeping Mode, hold down Auntil the
second starts to flash, which indicates the setting
screen.
2. Press Conce and the DST setting screen appears.
3. Press Dto toggle between Daylight Saving Time (On
displayed) and Standard Time (OF displayed).
4. Press Ato exit the setting screen.
xThe DST indicator appears on the Timekeeping and
Alarm Mode screens to indicate that Daylight Saving
Time is turned on.
DST indicator
On/Off status
EN-13
4. Press Ato exit the setting screen.
xThe day of the week is displayed automatically in accordance with the date
(year, month, and day) settings.
xSee “Daylight Saving Time (DST) Setting” below for details about the DST
setting.
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press Dto toggle between 12-hour timekeeping and
24-hour timekeeping.
xWith the 12-hour format, the P(PM) indicator appears to the left of the hour digits
for times in the range of noon to 11:59 p.m. and the A(AM) indicator appears to
the left of the hour digits for times in the range of midnight to 11:59 a.m.
xWith the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
any indicator.
xThe 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all other modes.
xThe Aand Pindicators are not displayed with the Timekeeping Mode time on the
Timer Mode and Dual Time Mode screens.
EN-12
3. When the setting you want to change is flashing, use Dand Eto change it as
described below.
Screen To do this: Do this:
Reset the second to 00
Press D.
Toggle between Daylight Saving Time (On) and
Standard Time (OF)
Change the hour or minute
Use D(+) and E(–).
Change the year
Change the month or day
EN-11
To set the time and date
1. In the Timekeeping Mode, hold down Auntil the
second starts to flash, which indicates the setting
screen.
2. Press Cto move the flashing in the sequence shown
below to select other settings.
Second MinuteHourDST
Day YearMonth
CC
CC
CC
C
Second
EN-10
Timekeeping
Use the Timekeeping Mode to set and view the current
time and date.
PM indicator
Month – Day
Day of week
Second
Hour Minute

Operation Guide 3511
EN-29
To recall stopwatch time records
1. In the Stopwatch Mode, check to make sure that the displays reset to all zeros
(page EN-19).
xIf all zeros are not displayed, reset the stopwatch.
2. Use the Ebutton to select either the lap time screen (to view lap time records) or
the split time screen (to view split time records) (pages EN-20 and EN-23).
xTo convert a lap time saved in the Stopwatch Mode to a split time, select the
split time screen.
3. Press the Cbutton to enter the Recall Mode.
4. Use the Abutton to scroll through the log title screens from the newest to the
oldest until the title screen of the log whose records you want to view is displayed.
5. Use D(forward) and E(back) to scroll through records in lap number sequence.
EN-28
Recall Mode
Use the Recall Mode to recall and delete logs and records
you stored in the Stopwatch Mode. You can use the
Recall Mode to view both lap and split time records.
xWhen you enter the Recall Mode, the newest log
recorded in the Stopwatch Mode will appear first. If
there are no logs in memory, –– – – appears on the
display.
xYou can use the Recall Mode to check memory data
even while a stopwatch elapsed time measurement
operation is in progress. However, the time data that is
currently being measured will not appear in the Recall
Mode.
xYou can convert a lap time saved in the Stopwatch
Mode to a split time (page EN-29).
Log Title Screen
Day of week
Log number
Month – Day
EN-27
How stopwatch data is stored
The following table shows how stopwatch data is stored when you perform
stopwatch button operations.
Stopwatch Button Operation Data Storage Description
From all-zeros, press Dto start. Creates a new log. Stores the date the button was
pressed, and the new log number.
Press Eto display lap/split time.
Creates a new record with each button operation.
Stores the lap and split times and total elapsed time
at each point the button is pressed.
Press Dto stop elapsed time
measurement and then press E
to reset.
Resets the elapsed time to all zeros without recording
data.
xSee “Recall Mode” (page EN-28) for details on how to recall time records from
memory.
EN-26
Memory Management
A new log is created each time you press Din the Stopwatch Mode to start a new
elapsed time measurement operation. A log contains a log title screen, and records
of all the lap or split times you record during the current elapsed time measurement
operation.
xThe capacity of the watch’s memory is 60 records.
xIf you are adding records to a log when there are multiple logs in memory and
watch memory becomes full, adding another record causes the oldest log in
memory and all of its records to be deleted automatically to make room for new
records.
EN-25
To time first and second place finishes
1. When the stopwatch display shows all zeros, press Eto display the split time
screen (indicated by SPL).
2. Press Dto start a time measurement.
3. Press Ewhen the first finisher crosses the finish line.
xThis freezes the time of the first finisher in the lower part of the display for about
eight seconds. After that, the display returns to elapsed time measurement.
4. Press Dwhen the second finisher crosses the finish line.
xThe second finisher’s time will appear in the lower display.
xThe difference between the first finisher’s and the second finisher’s time will
appear in the upper display.
5. Press Eto clear the stopwatch to all zeros.
EN-24
4. Repeat step 3 to record more split times.
5. Press Dto stop the stopwatch.
6. Press Eto clear the stopwatch to all zeros.
xSplit numbers are incremented automatically starting
from 1whenever you press Ein step 3 of the
above procedure. The maximum split number is
99. Recording a split time after that causes the split
number count to restart from 00.
Split Time Recording
(Displayed for eight seconds
after Eis pressed.)
Split number
Split time
EN-23
To measure elapsed time with split times
1. When the stopwatch display shows all zeros, press E
to display the split time screen (indicated by SPL).
2. Press Dto start an elapsed time measurement.
xAt the time, both the upper and lower displays will
show identical times.
3. Press Eto record the time of the first split.
xThe current split time appears in the lower display
for about eight seconds, as the total elapsed time,
next lap time, and next split time continue to be
timed internally by the watch. The split number of the
displayed time appears in the upper display.
xAfter eight seconds, the ongoing lap time
measurement appears in the upper display and the
ongoing elapsed time measurement appears in the
lower display.
Lap time
Elapsed time
EN-22
4. Repeat step 3 to record more lap times.
5. Press Dto stop the stopwatch.
6. Press Eto clear the stopwatch to all zeros.
xLap numbers are incremented automatically starting from 1whenever you press
Ein step 3 of the above procedure. The maximum lap number is 99. Recording
a lap after that causes the lap number count to restart from 00.
EN-21
Lap time
Elapsed time Lap number
Lap time
xThis freezes the current lap time in the upper part of the display for about
eight seconds, while measurement of total elapsed time and the next lap time
continue internally. The lap number of the displayed time appears in the lower
display.
xAfter eight seconds, the ongoing elapsed time measurement re-appears in the
lower display.
EN-20
To measure elapsed time with lap times
1. When the stopwatch display shows all zeros, press E
to display the lap time screen (indicated by LAP).
2. Press Dto start an elapsed time measurement.
xAt the time, both the upper and lower displays will
show identical times.
3. Press Eto record the time of the first lap.

Operation Guide 3511
EN-39
3. Press Cto move the flashing in the sequence shown below to select other
settings.
Hour Minute Month Day
CCC
C
4. While a setting is flashing, use D(+) and E(–) to change it.
xTo set an alarm that does not include a month (daily alarm, monthly alarm), set
−for the month. Use Dand Euntil the −mark appears (between 12 and 1)
while month setting is flashing.
xTo set an alarm that does not include a day (daily alarm, 1-month alarm), set − −
for the day. Use Dand Euntil the −−mark appears (between the end of the
month and 1) while the day setting is flashing.
xWhen setting the alarm time using the 12-hour format, take care to set the time
correctly as a.m. (Aindicator) or p.m. (Pindicator).
5. Press Ato exit the setting screen.
EN-38
To set an alarm time
1. In the Alarm Mode, use Dto scroll through the alarm
screens until the one whose time you want to set is
displayed.
–1 –3–2 :00
DDD
D
xAlarm 1has a snooze feature.
xThe snooze alarm operation repeats every five
minutes.
2. After you select an alarm, hold down Auntil the hour setting of the alarm time
starts to flash. This indicates the setting screen.
xThis operation turns on the alarm automatically.
EN-37
Alarm Types
The alarm type is determined by the settings you make, as described below.
xDaily alarm
Set the hour and minutes for the alarm time. This type of setting causes the alarm to
sound everyday at the time you set.
xDate alarm
Set the month, day, hour and minutes for the alarm time. This type of setting causes
the alarm to sound at the specific time, on the specific date you set.
x1-Month alarm
Set the month, hour and minutes for the alarm time. This type of setting causes the
alarm to sound everyday at time you set, only during the month you set.
xMonthly alarm
Set the day, hour and minutes for the alarm time. This type of setting causes the
alarm to sound every month at the time you set, on the day you set.
EN-36
Alarm
You can set up to three independent multi-function alarms
with hour, minutes, month, and day. When an alarm is
turned on, the alarm tone sounds when the alarm time is
reached. One of the alarms has a snooze feature.
You also can turn on an Hourly Time Signal that causes
the watch to beep twice every hour on the hour.
xThere are three alarm screens numbered 1through 3.
The hourly time signal screen is indicated by :00.
xAll of the operations in this section are performed in
the Alarm Mode, which you enter by pressing C(page
EN-9).
Alarm date
(Month −Day)
Alarm time
(Hour : Minute)
Alarm number
EN-35
3. Perform the following operations, depending on which setting currently is selected
on the display.
xWhile the start time setting is flashing, use D(+) and E(–) to change it.
xSet 0:00 to specify 24 hours.
xWhile the auto-repeat on/off setting (On or OF) is flashing on the display, press
Dto toggle auto-repeat on (On) and off (OF).
4. Press Ato exit the setting screen.
xThe auto-repeat on indicator ( ) is displayed on the Timer Mode screen while
this function is turned on.
xFrequent use of auto-repeat and the alarm can run down battery power.
EN-34
To configure countdown start time and auto-repeat settings
1. While the countdown start time is on the display in the
Timer Mode, hold down Auntil the hour setting of the
countdown start time starts to flash, which indicates the
setting screen.
xIf the countdown start time is not displayed, use the
procedure under “To use the countdown timer” (page
EN-33) to display it.
2. Press Cto move the flashing in the sequence shown
below, and select the setting you want to change.
Start Time
(Hours)
Start Time
(Minutes)
Auto-Repeat
On/Off
CC
C
On/Off status
Auto-repeat on indicator
EN-33
To use the countdown timer
Press Dwhile in the Timer Mode to start the countdown timer.
xWhen the end of the countdown is reached and auto-repeat is turned off, the alarm
sounds for 10 seconds or until you stop it by pressing any button. The countdown
time is reset automatically to its starting value after the alarm stops.
xWhen auto-repeat is turned on, the countdown will restart automatically without
pausing when it reaches zero. The alarm sounds when the countdown reaches
zero.
xThe countdown timer measurement operation continues even if you exit the Timer
Mode.
xPress Dwhile a countdown operation is in progress to pause it. Press Dagain to
resume the countdown.
xTo stop a countdown operation completely, first pause it (by pressing D), and
then press E. This returns the countdown time to its starting value.
EN-32
Timer
You can set the countdown timer within a range of one
minute to 24 hours. An alarm sounds when the countdown
reaches zero.
xYou also can select auto-repeat, which automatically
restarts the countdown from the original value you set
whenever zero is reached.
xAll of the operations in this section are performed in
the Timer Mode, which you enter by pressing C(page
EN-9).
Auto-repeat on indicator
Seconds
Timekeeping Mode time
Hours Minutes
EN-31
xWhether you will be able to view lap time records or split time records will
depend on the screen you selected in step 2, above.
To delete a log
1. In the Recall Mode, display the title screen of the log you want to delete.
2. Hold down Dand Euntil CLR stops flashing on the display.
xThis deletes the log and all the records inside it.
xDeleting a single log slides all newer logs (ones with higher log numbers)
upwards to fill the empty space. This cause the log numbers of all the newer
logs to be reduced by 1. If there are six logs currently in memory (numbered 01
through 06) and you delete log 03, the numbers of logs that previously were
numbered 04, 05, and 06 will change to 03, 04, and 05.
EN-30
Split numberSplit time
First record Last record
Log Title Screen
Lap time Lap number
Log number
D
EE
D

Operation Guide 3511
EN-49
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Auto Return Feature
xIf you leave a screen with flashing digits on the display for two or three minutes
without performing any operation, the watch saves any settings you have made up
to that point and exits the setting screen automatically.
xThe watch will change to the Timekeeping Mode automatically if you do not
perform any operation in the Recall Mode or Alarm Mode for two or three minutes.
EN-48
To specify the illumination duration
1. In the Timekeeping Mode, hold down Auntil the
seconds start to flash, which indicates the setting
screen.
2. While the seconds are flashing, press Eto toggle the
setting between 1.5seconds (−) and 3seconds ( ).
3. Press Ato exit the setting screen.
EN-47
Illumination
An LED (light-emitting diode) illuminates the face of the
watch for easy reading in the dark.
xSee “Illumination Precautions” (page EN-51) for other
important information about using illumination.
To illuminate the display
In any mode, press Bto turn on illumination.
xYou can use the procedure below to select either
1.5seconds or 3seconds as the illumination duration.
When you press B, illumination will remain on for about
1.5seconds or 3seconds, depending on the current
illumination duration setting.
EN-46
5. Press Ato exit the setting screen.
xThe DST indicator on the Dual Time Mode screen indicates that DST is turned
on for the Dual Time Mode time.
EN-45
3. Press Cto move the flashing in the sequence shown below to select the other
settings.
DST Hour Minute
CC
C
4. When the setting you want to change is flashing, use Dand Eto change it as
described below.
Screen To do this: Do this:
Toggle between Daylight Saving Time (On)
and Standard Time (OF)Press D.
Change the hour or minute Use D(+) and E(–).
EN-44
Dual Time
The Dual Time Mode lets you keep track of time in a
different time zone. You can select Standard Time or
Daylight Saving Time for the Dual Time.
xThe seconds count of the Dual Time is synchronized
with the seconds count of the Timekeeping Mode.
To set the Dual Time
1. Press Cto enter the Dual Time Mode (page EN-9).
2. In the Dual Time Mode, hold down Auntil the DST
setting starts to flash, which indicates the setting
screen.
Timekeeping Mode time
Dual time
(Hour : Minute Second)
EN-43
To turn the hourly time signal on and off
1. In the Alarm Mode, use Dto select the Hourly Time
Signal.
2. Press Ato toggle the displayed item on and off.
xTurning on the Hourly Time Signal displays the hourly
time signal on indicator on its screen.
xThe hourly time signal on indicator is displayed in all
modes.
Hourly time signal on
indicator
EN-42
xDisplaying the Alarm 1setting screen (page EN-38) while the snooze alarm is
turned on turns off the snooze alarm automatically.
To turn Alarms 2 and 3 on and off
1. In the Alarm Mode, use Dto select alarm number 2
or 3.
2. Press Ato toggle the displayed alarm on and off.
xTurning on an alarm (2or 3) displays the alarm on
indicator on its screen.
xThe alarm on indicator is displayed in all modes.
xIf any alarm is on, the alarm on indicator is shown on
the display in all modes.
Alarm on indicator
EN-41
To select the operation of Alarm 1
1. In the Alarm Mode, use Dto select Alarm 1.
2. Press Ato cycle through the available settings in the sequence shown below.
AAA
Alarm on Snooze feature on Alarm off
xThe applicable alarm on indicator is displayed in all modes when an alarm is
turned on.
xThe snooze indicator flashes while the snooze alarm is sounding and during the
5-minute intervals between alarms.
EN-40
Alarm Operation
The alarm sounds at the preset time for about 10 seconds. When The snooze feature
(Alarm1) is turned on, the alarm operation is performed a total of seven times, every
five minutes, until you turn the alarm off or turn off the snooze feature (page EN-41).
xAlarm and Hourly Time Signal operations are performed in accordance with the
Timekeeping Mode time.
Note
xPressing any button stops the alarm tone operation.
xPerforming any one of the operations below during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen (page EN-11)
Displaying the Alarm 1setting screen (page EN-38)
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.

Operation Guide 3511
EN-53
Timer:
Measuring unit: one second
Input range: one minute to 24 hours (1-minute increments and 1-hour increments)
Other: Auto-repeat timing
Alarm: 3 Multi-function* alarms (1 with snooze feature); Hourly Time Signal
* Alarm type: Daily alarm, Date alarm, 1-month alarm, Monthly alarm
Dual Time: Hour, minute, second, a.m. (A)/p.m. (P)
Other: Daylight Saving Time (summer time)/Standard Time
Illumination: LED (light-emitting diode); Selectable illumination duration
(approximately 1.5seconds or 3seconds)
Other: Button operation tone on/off
Battery:
One lithium battery (Type: CR2025)
Approximately 10 years on type CR2025 (10 seconds of alarm operation per day,
one illumination operation (1.5 seconds) per day)
Specifications are subject to change without notice.
EN-52
Specifications
Accuracy at normal temperature: ± 30 seconds a month
Timekeeping: Hour, minute, second, a.m. (A)/ p.m. (P), month, day, day of the week
Time format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099
Other: Daylight Saving Time (summer time)/Standard Time
Stopwatch:
Measurement Capacity: 99hours, 59minutes, 59seconds
Measurement Units: Depends on range.
Lap Times: 1/100 second from 00:0000 to 00:5959.99; 1second from 1:0000to
99:5959
Split Times: 1/100 second from 00:0000 to 09:5959.99; 1 second from
10:0000to 99:5959
Measurement Types: Elapsed time, lap times, split times, two finishes
Memory Capacity: 60records (used for lap times and split times)
Other: Lap/split numbers
EN-51
Scrolling
The Dand Ebuttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a
scroll operation scrolls through the data at high speed.
Timekeeping
xResetting the seconds to 00 while the current count is in the range of 30 to
59causes the minutes to be increased by 1. In the range of 00 to 29, the seconds
are reset to 00 without changing the minutes.
xThe year can be set in the range of 2000 to 2099.
xThe watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there should be no reason to
change it except after you have the watch’s batteries replaced.
Illumination Precautions
xIllumination may be difficult to see when viewed under direct sunlight.
xIllumination turns off automatically whenever an alarm sounds.
xFrequent use of illumination runs down the battery.
EN-50
Button Operation Tone
The button operation tone sounds any time you press one
of the watch’s buttons. You can turn the button operation
tone on or off as desired.
xThe multi-function alarms and Timer Mode alarm will
sound even if the button operation tone is turned off.
To turn the button operation tone on and off
In any mode (except when a setting screen is on the
display), hold down Cto toggle the button operation tone
on (mute indicator not displayed) and off (mute indicator
displayed).
xHolding down Cto turn the button operation tone on or
off also causes the watch’s current mode to change.
xThe mute indicator is displayed in all modes when the
button operation tone is turned off.
Mute indicator