Casio Classic Watch - F-91WC-2AEF

The battery should last approximately 7 years. You can replace the battery by taking the watch to a qualified watch repair shop, as opening the case yourself may void the warranty.

Yes, the watch is water-resistant. However, avoid pressing buttons underwater and do not expose it to extreme water pressure or hot water.

Press the Mode button until the stopwatch is displayed. Press the Start/Stop button to start or stop the stopwatch. Press the Reset button to reset the stopwatch to zero.

Press the Mode button until the alarm time is displayed. Use the Adjust button to set the desired alarm time. Press the Mode button to exit the alarm settings.

The watch has an accuracy of +/- 30 seconds per month.

Yes, you can change the display format by pressing the mode button until the time is displayed, then holding the adjust button.

The watch case is made of resin.

Press the light button to activate the microlight. If the display is still dim, the battery may be low, or the viewing angle might be poor. Try a different angle or replace the battery if needed.

Check the time settings and ensure that the correct time zone and daylight saving time settings are selected. If the problem persists, it may require a battery change or repair.

Make sure the buttons are not blocked by debris. If the buttons still don't work, reset the watch by removing the battery for a few minutes and then reinserting it.