G-SHOCK GMAS120MF-2A2 - Watch CASIO - Free user manual and instructions
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| Product Type | Watch |
| Brand | Casio |
| Model | G-SHOCK GMAS120MF-2A2 |
| Case Size | 45.9 × 40.4 × 11.6 mm |
| Weight | 45 g |
| Water Resistance | 200 meters (20 ATM) |
| Power Source | CR1220 battery (approx. 2 years life) |
| Shock Resistance | Yes |
| Display Type | Digital |
| LED Light | Super Illuminator (high-brightness) |
| World Time | 31 time zones (48 cities + UTC) |
| Stopwatch | 1/100 second, up to 24 hours |
| Countdown Timer | 1/10 second, up to 24 hours |
| Alarms | 5 daily alarms (1 snooze) |
| Hourly Time Signal | Yes |
| Calendar | Auto-calendar (to 2099) |
| Accuracy | ±30 seconds per month |
| Band Material | Resin |
| Bezel Material | Resin |
| Glass | Mineral glass |
| Time Format | 12/24-hour switchable |
| Button Operation Tone | On/off |
| Maintenance | Clean with soft dry cloth; avoid extreme temperatures |
Frequently Asked Questions - G-SHOCK GMAS120MF-2A2 CASIO
How do I set the time on my G-SHOCK GMAS120MF-2A2?
In normal timekeeping mode, hold down the adjust button (usually top left) until the seconds flash. Use the search button (top right) to change the value, and the mode button (bottom right) to move to next setting. Press adjust button to exit.
Is the G-SHOCK GMAS120MF-2A2 water resistant?
Yes, it is water resistant to 200 meters (20 ATM). Suitable for swimming, snorkeling, but not scuba diving.
How do I replace the battery?
The battery is a CR1220. Remove the back cover using a screwdriver, replace the battery with the positive side up, and close the back cover securely. Ensure the gasket is properly seated for water resistance.
What is the battery life of this watch?
The battery life is approximately 2 years under normal use, depending on usage of light and alarms.
How do I use the stopwatch?
Press the mode button to enter stopwatch mode. Press the start/stop button (top right) to start and stop. Press the reset button (bottom right) to reset. The stopwatch measures up to 24 hours in 1/100-second increments.
How do I set an alarm?
In alarm mode, hold the adjust button until the hour digits flash. Use the search button to set the hour and minute, pressing mode button to move between. Press adjust button to save and enable/disable the alarm.
What is the LED light feature?
The watch has a Super Illuminator LED light that illuminates the display for reading in the dark. Press the light button (bottom left) to activate.
How do I change the world time?
In world time mode, use the search button to scroll through time zones. Hold the adjust button to swap the world time with the home time. You can select from 31 time zones.
Is the watch shock resistant?
Yes, it is shock resistant as per G-SHOCK standards. It can withstand impacts from daily use and drops.
How do I turn off the button operation tone?
Hold down the adjust button in timekeeping mode. Press the search button to cycle through settings until you see 'KEY' or a speaker icon. Use the mode button to toggle the tone on or off.
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USER MANUAL G-SHOCK GMAS120MF-2A2 CASIO
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Product information
Brand : CASIO
Model : G-SHOCK GMAS120MF-2A2
Category : Watch