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Operation Guide 5770
MA2603-EA
© 2026 CASIO COMPUTER CO., LTD.
Published: 3/2026
You can also find information about
operational procedures at the CASIO website.
https://s.casio.jp/mw/en/5770/
Specifications
Accuracy: ±20 seconds average per month
Stopwatch: Measuring Capacity: 59'59" (60 minutes)
Measuring Unit: 1 second
Measurements: Elapsed time
Battery: One silver oxide battery (Type: SR927W)
Battery nominal voltage: 1.55V
Battery Life: Approximately 5 years (60 minutes stopwatch operation per day)
Specifications are subject to change without notice.
Perform the following procedure if the Stopwatch Second Hand does not return to its
0 (zero) position when you reset the stopwatch.
Correcting the 0 Positions of the Hand
Pull the Crown out to Click 2.
Use A to move the
Stopwatch Second Hand
to 12 o’clock.
x Holding down A will move the second hand at high speed, until you release the
button.
After the hand is the way you want, push the Crown back in.
Important!
x Timekeeping stops while the crown is pulled out. Correct the current time setting
after performing the above operation.
Using the Stopwatch
Important!
x Do not operate the stopwatch with the crown pulled out.
Note
x An elapsed time operation will stop automatically at the end of 60 minutes.
The stopwatch measures elapsed time in 1-second increments up to 59minutes,
59seconds.
Elapsed time
A
A
A A
B
Start Stop Resume Stop Reset
30
To change the day indicator setting
To adjust the time setting
Pull the Crown out to Click 1.
Push the Crown back in.Push the Crown back in.
Rotate the Crown to change the
time setting.
Pull the Crown out to Click 2.
Rotate the Crown away from you
to set the day.
Note
x Take care that you set the correct AM
or PM time.
Note
x The day indicator setting uses a
31-day month. Make adjustments for
months of shorter lengths.
x Avoid changing the day indicator
setting between the hours of 9
p.m. and 1 a.m. Otherwise, the day
indicator may not change correctly
at midnight.
Crown Operations
Some water-resistant models (10BAR, 20BAR) have a screw-
in crown. When you need to perform a crown operation,
rotate it towards you to unscrew it. Then pull the crown out.
Avoid applying undue force when pulling. The watch loses
its water resistance while the crown is unscrewed. After
performing a crown operation, fully screw the crown back in.
Crown
Loosen
If your watch has a rotary bezel...
You can rotate the bezel to align its
▼
mark with the
minute hand. Then you will be able to tell how much
time has elapsed since aligning the
▼
mark.
Start
Elapsed time
Current
Stopwatch functions
Day Indicator
Click 2
Click 1
Hour Hand
Minute Hand
A
B
Crown
Stopwatch Minute Hand
24 Hour Hand
Stopwatch Second Hand
x Your watch may differ somewhat from the one shown in the illustration.
