User manual
User’s Guide 5526 (MRG)
E-15 
 Time Zone setting
Important!
 x  In order to prevent loss of water resistance and damage due to impact, make sure that the crown is 
fully pushed in to its normal position after operating it.
 x  For details about summer time settings and time zone settings, refer to the Operation Guide available 
at the CASIO website. 
http://world.casio.com/manual/wat/
E-14  
 Using the Watch in a Medical Facility or Aircraft
 x  Disable auto time adjustment whenever you are in a medical facility, and aircraft, in any other area 
where radio wave reception and connection with a phone are prohibited or restricted.
 x  Disabling auto time adjustment disables time calibration signal auto receive and auto connection with 
a phone.
 x  Press B once and then pull out the crown to the first click. The second hand will move to Y (YES) 
(auto receive enabled) or N (NO) (auto receive disabled). To disable auto time adjustment, rotate the 
crown to move the second hand to N (NO). To enable auto time adjustment, rotate the crown to 
move the second hand to Y (YES). After the setting is the way you want, push the crown back in to its 
normal position.
30
E-13 
C
 Stopwatch Mode  Countdown Timer Mode
30
 x Start
 x Stop
Seconds
 x Reset x  Enters the 
Countdown 
Timer Mode
Points to ST
Hours
Minutes
Hours 
(0 to 24)
C
30
 x Start
 x Stop
Seconds
 x Reset x  Enters the 
Alarm Mode
Points to TR
Hours
Minutes
Hours 
(0 to 24)
C
 Alarm Mode
* The A-side of the dial indicates an a.m. time, while 
the P-side indicates a p.m. time.
 x  Hold down C for about four seconds to establish 
a Bluetooth connection with a phone. For details, 
refer to the Operation Guide available at the CASIO 
website.
http://world.casio.com/manual/wat/
30
 x Illumination
Alarm on
 x Alarm off x  Enters the 
Timekeeping 
Mode
Points to AL
Hours
Minutes
Hours 
(0 to 24)
 x  Holding down C for two seconds in any mode returns to the Timekeeping Mode.
E-12  
 Mode Reference Guide
 x Use C to navigate between modes.
Timekeeping Mode
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Minute hand
Day of the week 
hand
24-hour hand
Hour hand
Second hand
Day Indicator
Crown
CB
A
Dual time hour hand
Dual time 24-hour hand*
Dual time minute hand
 x  Pressing A turns on the illumination.
 x  To swap your Home Time with the Dual Time, 
hold down A for threeseconds.
 x  To view the result of last time calibration by 
time signal reception or Mobile Link, press 
B once.
 x  To trigger a time calibration by Mobile Link 
manually, hold down B for 0.5seconds.
 x  To trigger a time calibration signal reception 
operation manually, hold down B for 
1.5seconds.
 x  To search for the phone (while the watch 
is connected with it), hold down B for 
3.5seconds.
 x  Press C once to enter the Stopwatch Mode.
C
E-11 
 Time Calibration Signal Manual Receive
1. Hold down B for at least two seconds until the second hand moves 
to RC (Receive). If the second hand is a position other than RC, keep 
B depressed until it moves to RC.
2. Place the watch near a window.
 x  The time setting will be adjusted automatically when a signal receive 
operation is successful.
 x  Calibration signal reception normally takes anywhere from about two 
to 10 minutes. It can take as long as 20 minutes.
 x  Best reception is in the middle of the night.
 x  If you are unable to receive a signal, check the Operation Guide 
available at the CASIO website to ensure the watch is in a suitable 
location.
http://world.casio.com/manual/wat/
30
Second hand
E-10  
 Time Calibration Signal Auto Receive
Important!
 x  To perform time calibration signal auto receive, the watch must be in the Timekeeping Mode. See 
“Mode Reference Guide” (page E-12).
 ●
 Leave the watch in a location that is appropriate for time calibration signal reception between 
the hours of midnight and 5:00 a.m. See “Appropriate Signal Reception Location (Time 
Calibration Signal)” (page E-9).
 x  The second hand will point to RC while time calibration signal reception is in progress.
 x  Reception normally takes anywhere from about two to ten minutes, but it can take as long as 
20minutes.
 x  When the receive operation is successful, the time and day settings will be adjusted automatically.
E-9 
  Timekeeping (Based on a Time Calibration Signal)
 Appropriate Signal Reception Location (Time Calibration Signal)
 x  Keep the watch away from metal and position it so its 6 o’clock side is 
facing a window. Avoid moving the watch as much as possible and do 
not perform any watch operations while a signal receive operation is in 
progress.
 ●
 You may experience time calibration signal reception problems in 
the areas described below.
 - Among or near buildings
 - While riding in a vehicle
 - Near household appliances, office machines, mobile phones, etc.
 - On a construction site, in an airport, or any other location where radio 
wave interference occurs
 - Near high-voltage lines
 - In mountainous areas or behind a mountain
 x  Always check the time setting on the day there should be a switch 
between standard time and summer time (DST). If the setting is not 
correct (due to signal reception failure), turn DST on or off manually as 
required.
6 o’clock
E-8  
 Timekeeping (Current Time and Day Adjustment)
 ●
 Timekeeping is kept accurate using information provided by a time calibration signal and by 
communication with a mobile phone.
 x Time calibration signals can be received using Auto Receive or Manual Receive (page E-9).
 x  To set the current time and day, normally use the procedure under “Time Calibration Signal Auto 
Receive” (page E-10).
 x  For information about how to adjust time using a phone, refer to the Operation Guide available at 
the website below.
http://world.casio.com/manual/wat/
 x  If you are in an area where a time calibration signal cannot be received or if you cannot connect 
with a phone for some reason, adjust time and date settings manually (page E-18).
Important!
 x  If you feel that the current time and/or day indicator are not in the correct positions, you can adjust 
their alignment. For details, see the Operation Guide available at the CASIO website.
 x  Time calibration signal reception is normally possible in the areas below.
Japan, China, North America, Europe
For details, see the Operation Guide available at the CASIO website.
 x  For details about the following operations, refer to the Operation Guide available at the CASIO website: 
Configuring Home City time differential (time zone), summer time, current time, and current date 
settings manually.
http://world.casio.com/manual/wat/



