[Casio] G-Shock Watch, Radio Solar GW-8900-1JF

The Casio G-Shock GW-8900-1JF is a powerhouse of durability and intelligent technology, crafted for men who demand performance, reliability, and rugged style. With solar charging, radio wave time correction, and the signature G-Shock shock resistance, this watch is ready for anything—from the city grind to the great outdoors.

Bold, black, and built to endure, the GW-8900-1JF is more than a timepiece. It’s a tactical tool wrapped in toughness, with a design that speaks to adventurers, professionals, and collectors alike.

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Why Choose the G-Shock GW-8900-1JF?

Tough Solar Technology for Hassle-Free Power

No battery changes, no interruptions. The GW-8900-1JF is powered by Casio’s Tough Solar system, converting both sunlight and indoor light into energy. Fully charged, the watch operates for months—even in total darkness. It’s the perfect companion for remote treks or urban schedules, keeping your wrist ready without worry.

Multiband 6 Radio-Controlled Accuracy

Set it once and forget it. This G-Shock syncs daily with atomic time signals transmitted from six stations around the world (Japan, North America, UK, Germany, and China). Whether you’re working late in Tokyo or hiking through California, you’ll always get accurate, automatic time correction—down to the second.

Shock-Resistant Structure That Withstands It All

G-Shock means resilience, and the GW-8900-1JF delivers. Its protective case design shields against shocks, drops, and vibrations, ensuring reliable performance in even the harshest conditions. Whether you're biking over rocky trails or caught in a sudden downpour, this watch keeps ticking.

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Built to Last, Designed to Stand Out

Large Case with Bold, Masculine Design

The oversized 55.1mm resin case makes a statement. Matte black with metallic accents, it balances utility and style. The deep-set face is protected by mineral glass, while wide buttons and clear display design make operation easy—even with gloves on.

Illuminated by Super LED Backlight

Day or night, readability is never an issue. The full auto Super Illuminator LED backlight lights up the large digital display with high-intensity brightness. Ideal for nighttime hikes, early morning training, or anytime you need instant clarity.

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Powerful Features That Support Any Lifestyle

World Time for the Global Explorer

Easily switch between 31 time zones (48 cities + UTC). Great for international business, travel, or simply staying connected with friends and family around the globe.

Stopwatch Function with 1/100-Second Accuracy

Need precise time tracking? The GW-8900-1JF delivers. The built-in stopwatch measures elapsed time, split time, and first/second place times with remarkable accuracy.

Countdown Timer for Training or Daily Routines

Set countdowns for workouts, reminders, or tasks. The countdown timer ranges from 1 minute to 24 hours—versatile enough for both short sprints and long tasks.

5 Daily Alarms with Hourly Time Signal

Stay punctual. Set up to five alarms throughout the day, perfect for meetings, hydration reminders, or wake-up calls. The hourly chime keeps your sense of time sharp without checking your phone.

Full Auto Calendar Until 2099

Once set, the calendar automatically adjusts for months and leap years. You’ll never have to update the date manually—even decades down the line.

Battery Level Indicator

Keep tabs on your solar charge with the on-screen battery level display. It’s a simple but essential feature that lets you know when it’s time to catch some sunlight.

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Comfort Meets Durability

Lightweight Yet Strong Resin Band

Designed for extended wear, the black resin strap is comfortable, flexible, and easy to clean. Resistant to sweat, grime, and everyday wear, it’s built for outdoor enthusiasts and active users.

200-Meter Water Resistance

Take it to the beach, the pool, or the trail—this G-Shock is ready. With 200 meters of water resistance, it handles swimming, snorkeling, and even showering. Just avoid deep diving, and you’re good to go.

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How to Use Your GW-8900-1JF

Setting the Time

Thanks to Multiband 6, manual setting is rarely needed. But if you’re in a location without radio signals, the watch can be adjusted manually through easy-to-follow button operations.

Charging the Battery

Expose the watch to sunlight regularly—ideal outdoors or near a window. Even indoor lighting contributes to charging, but sunlight is most effective for maintaining full power.

Switching Between Modes

Cycle through timekeeping, world time, alarms, stopwatch, and countdown timer with a press of the Mode button. Each feature is intuitively laid out for quick access.

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Ideal for All Occasions

Outdoor & Adventure Use

Whether you’re climbing, camping, or trail running, the GW-8900-1JF is built to handle whatever nature throws at you. Shock-resistant, water-resistant, and solar-powered—it’s as tough as the terrain.

Professional & Everyday Wear

The all-black design and digital clarity make this watch suitable for both work and play. It complements business-casual attire just as well as weekend wear.

Travel Companion

Its time-syncing, world-time feature, and solar power make it a go-to choice for frequent flyers and global explorers. Always on time, always powered, always reliable.

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What’s in the Box?

Your GW-8900-1JF arrives in secure and stylish packaging, perfect for gifting or collecting. Inside, you’ll find:

• 1 × Casio G-Shock GW-8900-1JF Watch

• 1 × User Manual (Japanese; English PDF available online)

• 1 × Casio Watch Box (G-Shock branded)

• 1 × Warranty Card (valid in Japan)

The watch is fully protected during shipping and ready to wear right out of the box.

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Care & Maintenance Tips

Regular Cleaning

Wipe the resin band and case with a soft cloth to remove dirt and sweat. If needed, rinse lightly with fresh water and pat dry.

Charge it Frequently

Even though it stores energy well, periodic sunlight keeps the Tough Solar system healthy. A few hours a week outdoors is enough.

Keep it Dry When Not in Use

Avoid storing the watch in extremely humid or dark environments for long periods. Dry storage helps preserve the electronics and strap material.

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Final Thoughts

The Casio G-Shock GW-8900-1JF is an exceptional blend of brute strength, precision technology, and thoughtful design. It’s a true G-Shock through and through—ready for the toughest conditions, yet refined enough for daily wear.

For those who lead active, on-the-go lives and want a timepiece that can keep up, this model delivers on every front. With solar power, radio control, world time, and an unmistakable G-Shock build, the GW-8900-1JF isn’t just a smart choice—it’s a lifelong companion.