Using your G-Shock GA2100SU-1ADR 'CasiOak' watch is a breeze. To set the time, just use the buttons on the side of the watch. You can easily switch between the 12 - hour and 24 - hour format according to your preference. The world time function is great if you travel a lot. Just select the desired time zone, and you'll always know the local time.
The stopwatch and countdown timer are handy for sports or any activity where you need to time something precisely. Set the alarms to wake you up or remind you of important events throughout the day.
When it comes to maintenance, keep the watch clean by wiping it with a soft, dry cloth regularly. Since it's 200 - meter water - resistant, you can wear it while swimming or in the shower, but avoid exposing it to hot water or high - pressure water jets. If the watch gets wet, dry it thoroughly. Also, try to keep the watch away from strong magnetic fields as they can affect its performance.