Do you have a question about the Casio SF-3905A and is the answer not in the manual?
Slide the battery compartment cover in the direction indicated by the arrow.
Slide the battery switch to the "REPLACE 1" setting.
Load new batteries, ensuring positive side is up, and set the switch to "REPLACE 2".
Slide the battery switch to the "LOCK" setting to enable unit operation.
Press the RESET button to complete the initial setup.
Avoid direct flame, heat, and disassembly for safe operation.
Clean the exterior with a soft cloth and mild detergent.
Manual contents may change; CASIO is not liable for third-party claims.
EL backlight allows viewing in dim light but shortens battery life.
"BATTERY LOW" indicates need for replacement; affects alarms and backlight.
Adjust display contrast using the or keys.
Instructions for changing the World Time city using TIME/ALARM and keys.
Guide to setting the Home Time city using TIME/ALARM and EDIT keys.
Instructions for setting the Home Time, including AM/PM and seconds.
Toggle standard and daylight saving time for Home and World Times.
Switch between 12-hour and 24-hour timekeeping formats.
Details on how the alarm sounds and how to stop it.
Steps to set the alarm time, including AM/PM designation.
Instructions to enable or disable Daily, Time Signal, Key Tone, and Schedule Alarms.
Details on character input, including case toggling and symbol input.
Guide to inputting data for Telephone Directory entries.
Guide to inputting data for the Schedule Keeper.
Instructions for inputting expense details and amounts.
Guide to inputting tasks or items for the To Do list.
Instructions for inputting short text memos.
Indicators and methods for scrolling through stored data.
How to search for data by scrolling through entries.
How to search for data using initial characters.
Steps to edit existing data entries.
Procedure to delete data entries from memory.
Guide to setting up a password for the secret memory area.
Steps to access the secret memory area using the password.
How to exit the secret memory area using specific keys.
Procedure to change the existing password for the secret area.
Mode for converting between Euros and national currencies.
How to select pre-programmed currencies and fixed exchange rates.
Examples and steps for converting amounts between currencies.
Procedure to edit currency names and their exchange rates.
Initial setup for converting between Dollars ($) and Pounds (£).
Examples of calculations performed in Calculator Mode.
Displays used and remaining memory capacity.
Instructions to press OFF to switch the unit off.
Step-by-step guide to replacing the unit's batteries.
Safety guidelines for handling and storing batteries.
Explanation of common messages like BUSY, FULL, BATTERY LOW.
List of cities with their time differences and other cities in the zone.