Casio G-Shock GD-120CM Men's Digital Camouflage Sport Watch

Introduction

This manual provides detailed instructions for the operation and maintenance of your Casio G-Shock GD-120CM digital sport watch. Designed for durability and functionality, the GD-120CM series combines robust construction with essential timekeeping features, making it suitable for various activities and environments. Please read this manual thoroughly to ensure proper use and to maximize the lifespan of your watch.

Figure 1: Front view of the Casio G-Shock GD-120CM watch, showcasing its digital display and camouflage pattern.

Key Features

• Shock Resistant: Engineered to withstand impacts and vibrations.
• LED Backlight (Super Illuminator): Provides bright illumination for easy reading in low light conditions.
• Flash Alert: Flashes with a buzzer for alarms, hourly time signals, and countdown timer end.
• Multi Time (4 different cities): Allows tracking of time in four different time zones.
• World Time: Displays the current time in 48 cities (31 time zones) and Coordinated Universal Time.
• 1/100-second Stopwatch: Measures elapsed time, split time, and 1st-2nd place times.
• Countdown Timer: Set a countdown from 1 minute to 24 hours.
• 5 Daily or One-time Alarms: Customizable alarms for daily reminders or specific events.
• Hourly Time Signal: An audible alert every hour on the hour.
• Full Auto-calendar (to year 2099): Automatically adjusts for different month lengths and leap years.
• 12/24-hour Format: Choose between standard 12-hour or military 24-hour time display.
• Water-resistant to 200m (660-Feet): Suitable for swimming, snorkeling, and diving.
• Approx. battery life: 7 years on CR2025.

Setup

Before using your watch, ensure the correct time and date are set. Refer to the button labels on your watch for 'ADJUST', 'MODE', 'REVERSE', and 'FORWARD'.

1. Setting the Home City:
   • In the Timekeeping Mode, press and hold the 'ADJUST' button until the city code starts to flash.
   • Use the 'REVERSE' and 'FORWARD' buttons to select your desired home city code.
   • Press 'MODE' to cycle through other settings like DST (Daylight Saving Time) and 12/24-hour format.
   • Use 'REVERSE' and 'FORWARD' to change the settings.
   • Press 'ADJUST' to exit the setting screen.
2. Setting the Time and Date:
   • After setting the home city, the seconds digits will flash. Use 'ADJUST' to move to the hour, minute, year, month, and day settings.
   • Use the 'REVERSE' and 'FORWARD' buttons to change the flashing value.
   • Press 'ADJUST' to confirm and exit.

Operating Instructions

Your GD-120CM watch has several modes accessible via the 'MODE' button. Press 'MODE' to cycle through Timekeeping, World Time, Stopwatch, Countdown Timer, and Alarm modes.

1. Timekeeping Mode: Displays the current time, date, and day of the week.
2. World Time Mode:
   • From Timekeeping Mode, press 'MODE' until 'WT' (World Time) appears.
   • Use 'REVERSE' and 'FORWARD' to scroll through different city codes and view their current times.
3. Stopwatch Mode:
   • From Timekeeping Mode, press 'MODE' until 'STW' (Stopwatch) appears.
   • Press 'START/STOP' (usually the top right button) to start and stop the stopwatch.
   • Press 'ADJUST' (usually the top left button) to reset the stopwatch to zero.
4. Countdown Timer Mode:
   • From Timekeeping Mode, press 'MODE' until 'TMR' (Timer) appears.
   • Press and hold 'ADJUST' to enter the setting mode.
   • Use 'REVERSE' and 'FORWARD' to set the desired countdown time.
   • Press 'ADJUST' to confirm, then 'START/STOP' to begin the countdown.
5. Alarm Mode:
   • From Timekeeping Mode, press 'MODE' until 'ALM' (Alarm) appears.
   • Use 'FORWARD' to cycle through the 5 alarms and the hourly time signal.
   • Press and hold 'ADJUST' to enter the alarm setting mode.
   • Use 'REVERSE' and 'FORWARD' to set the alarm time.
   • Press 'ADJUST' to confirm. Press 'START/STOP' to toggle the alarm ON/OFF.
6. LED Backlight (Super Illuminator):
   • Press the 'LIGHT' button (usually the bottom right button) to illuminate the display.
   • The watch may also feature an auto-light function, which illuminates the display when the watch is tilted towards your face.

Figure 2: The Casio G-Shock GD-120CM watch worn on a wrist, demonstrating its size and digital display visibility.

Maintenance

Proper care will ensure the longevity and performance of your G-Shock watch.

• Water Resistance: The watch is water-resistant to 200 meters. Do not operate buttons while the watch is submerged in water. After exposure to saltwater, rinse the watch with fresh water and wipe it dry.
• Cleaning: Wipe the watch with a soft, dry cloth. For stubborn dirt, use a mild soap solution and a soft brush, then rinse thoroughly and dry.
• Battery Replacement: The approximate battery life is 7 years. When the display becomes dim or functions become erratic, it is time to replace the battery. It is recommended to have the battery replaced by an authorized Casio service center to ensure water resistance is maintained.
• Temperature Exposure: Avoid exposing the watch to extreme temperatures, direct sunlight for prolonged periods, or strong magnetic fields.

Troubleshooting

• Display is blank or dim: The battery may be low or depleted. Replace the battery.
• Time is incorrect: Ensure your home city setting is correct. Re-adjust the time and date as per the 'Setup' section.
• Buttons are unresponsive: Ensure the watch is not in a locked mode (if applicable) or that it is not submerged in water. If the issue persists, a reset may be required (refer to the full user manual for specific reset procedures).
• Water inside the watch: Immediately take the watch to an authorized service center. Do not attempt to dry it yourself.

Specifications

Figure 3: A size comparison chart for watches, illustrating various watch face diameters.

Warranty and Support

Your Casio G-Shock GD-120CM watch comes with an International Warranty Card. Please retain this card and your proof of purchase for any warranty claims.

For detailed warranty information, service, or additional support, please refer to the official Casio website or contact an authorized Casio service center. The full user manual, which includes comprehensive instructions for all functions and troubleshooting, can also be found on the Casio support page.

Figure 4: The Casio G-Shock watch presented in its distinctive hexagonal metal tin, featuring a camouflage design.