Watch Casio GA-100-1A2ER

The Casio GA-100-1A2ER is a durable analog-digital wristwatch with a resin case and band, mineral glass and a CR1220 battery that provides approximately two years of power. Lightweight at around 70 g and sized 51.2 × 55 × 16.9 mm, it combines shock and magnetic resistance with multiple timekeeping functions suited for everyday wear, sports and outdoor activities.

Advantages

The watch features an Auto-LED light with Auto Light Switch for easy reading when angled toward the face, shock-resistant construction and magnetic shielding for reliable operation in demanding environments. It includes world time for major cities, a high-precision stopwatch (1/1000 sec up to 100 hours), a countdown timer with automatic repeat (1 minute resolution up to 24 hours), five daily alarms with snooze and an automatic calendar. Mineral glass resists scratches while the resin case and band provide durability and flexibility. Water resistance to 20 bar (200 m) makes it suitable for activities such as free diving without scuba gear.

Suitable for

Key specifications

How to use

Set the time and date using the crown and mode buttons as described in the user manual. Use the mode button to cycle between timekeeping, stopwatch, timer, alarm and world time screens. Start and stop the stopwatch or timer with the designated start/stop button; use the reset button to clear measurements. Activate the Auto Light Switch if you want the LED to illuminate when the watch is tilted toward your face. Replace the CR1220 battery after about two years or when functions begin to weaken.

Recommendations

For reliable performance, avoid strong magnetic fields for extended periods despite magnetic resistance, clean the resin band with mild soap and water, and have the battery replaced by an authorized service center to maintain water resistance and integrity.