G-SHOCK radio-controlled solar-powered models have been popular with people of all ages. Their appeal lies in their high reliability, allowing them to continue to keep accurate time despite requiring little maintenance. This article will provide a detailed explanation of the basic mechanics of radio-controlled solar-powered watches, as well as how to choose the right one and how to maintain them for long-term use.
What is G-SHOCK's radio-controlled solar watch? Basic functions and mechanism
The G-SHOCK radio-controlled solar model is the ultimate expression of the most important function of a wristwatch: accurate timekeeping. This model features an automatic time correction function that uses standard radio waves and CASIO's proprietary solar charging system called "Tough Solar."
These innovative features have made it possible for users to use it on a daily basis as a reliable timepiece that tells the correct time without any hassle, and it has gained widespread support.
What is radio solar standard radio wave reception?
The radio wave reception function is a function that receives standard radio waves transmitted from a transmitting station operated by the Japan Standard Time Project and automatically corrects the time.
In Japan, the watch can always display accurate time by receiving radio waves transmitted from two transmitters located in Fukushima and Fukuoka prefectures.
Models that support Multiband 6 are compatible with standard radio waves from China, North America, the UK, and Germany in addition to the two Japanese stations.
Even when traveling abroad, the watch automatically adjusts to the local time, eliminating the need to manually set the time.
CASIO's unique solar charging system "Tough Solar"
"Tough Solar," developed by CASIO, is a technology that has opened up new possibilities for solar charging.
This system is equipped with high-performance solar panels that can generate electricity efficiently not only from sunlight but also from weak light such as indoor fluorescent lights and LED lights.
The generated electricity is stored in a large-capacity secondary battery, and when fully charged, it can continue to operate for several months even in an environment without light.
This means that the watch can operate reliably even in an office or other indoor living environment. This low-maintenance, environmentally friendly design offers greater convenience than conventional wristwatches.
Advantages of the G-SHOCK radio-controlled solar model
The advantage of radio-controlled solar-powered models is that they offer both accurate time display and stable operation. Compared to traditional battery-powered watches and smartwatches, they offer significant advantages in terms of ease of maintenance and reliability.
Always display the correct time
The greatest feature of radio solar models is that they can always maintain accurate time by receiving standard radio waves.
Normally, the system automatically receives radio waves late at night to correct the time discrepancy, but manual reception is also possible, allowing adjustments to be made at any time as needed.
In addition, the Multiband 6 compatible model can receive standard radio waves from six stations around the world, including Japan, and automatically switches to local time when traveling abroad.
This means there is no need to use multiple watches overseas, freeing you from the hassle of setting the time.
No need to change batteries frequently
Casio's proprietary solar charging system, "Tough Solar," eliminates the need for periodic battery changes, a major advancement over conventional watches. Equipped with a solar panel that can generate power efficiently even in weak light, the watch can operate for several months even in everyday lighting conditions.
In addition, the watch has a power saving function that automatically reduces power consumption when placed in a dark place.
The charging status can be checked on the LCD screen and indicator, preventing sudden battery drain and ensuring high reliability even during long-term use.
Highly durable and waterproof
The shock-resistant structure and high water resistance that are the hallmarks of G-SHOCK are also inherited by the radio-controlled solar model.
In addition to a hollow structure and shock-absorbing design that protect the internal mechanism, the watch comes standard with 20-atmosphere water resistance, which exceeds the level required for everyday life, making it suitable for water activities.
In addition, some models use inorganic glass or sapphire glass, making them robust enough to withstand everyday use and harsh outdoor environments.
This ensures a wide range of reliability, suitable for not only sports and outdoor activities but also business situations.
How to prolong the life of your G-SHOCK radio-controlled solar-powered watch
With proper care, radio-controlled solar-powered models can maintain their performance for a long period of time. It is important to understand and practice basic maintenance methods.
Charge by exposing to light when not in use
To get the most out of your solar charging system, regular charging management is essential. While indoor fluorescent or LED lights can be used for charging, regular exposure to sunlight is recommended for efficient charging.
Specifically, you can keep the secondary battery in good condition by exposing it to light in a bright place near a window for about half a day about once a month.
Even if you don't use your watch for a long period of time, it needs to be periodically charged to prevent it from completely discharging. If it stops due to insufficient charge, it will require a long time to restart, so daily maintenance is the key to extending the life of your watch.
Regular maintenance
Regular maintenance is important to maintain the reliability and appearance of your watch. Cleaning the band and case is especially important. Leaving sweat and dirt on the watch can cause corrosion of the metal parts and deterioration of the band.
Cleaning is sufficient by wiping with a soft cloth and water, but it is recommended to clean more frequently during the summer when people tend to sweat more.
In addition, to maintain waterproof performance, we recommend having your watch inspected for water resistance, including replacing the gaskets, approximately once every two years.
This waterproofing test protects the internal components of the watch and ensures that it maintains its performance over the long term.
Do not place the device in a location where it should not be charged.
It is also important to pay attention to the environment when using solar charging. Charging in a high-temperature location may damage the watch or reduce charging efficiency.
Avoid storing the device on the dashboard of a car under the hot sun, near heat sources such as incandescent or halogen lamps, or in places exposed to direct sunlight for long periods of time.
The optimum temperature for charging is said to be 60°C or below, and environments above that pose a risk of deterioration of the internal circuitry and secondary battery. The ideal charging conditions are at room temperature and in direct sunlight or artificial light.
Introducing recommended G-SHOCK radio solar models
The latest radio-controlled solar-powered models have not only improved their basic performance, but have also evolved in terms of design and functionality. Here we will introduce some particularly noteworthy models.
GW-M5610U-1JF
Tough Solar. Operates for approximately 22 months on a full charge (power save mode). Resin case (46.7mm x 43.2mm, 12.7mm thick). Water resistant to 20 bar. Price: 24,200 yen (tax included).
The GW-M5610U-1JF, which features a square face, is a model that inherits the classic G-SHOCK design while incorporating modern functions.
Equipped with a Multiband 6 radio wave reception function and Tough Solar, it provides the convenience of accurate time display and low maintenance.
The highly visible digital display and super illuminator make it easy to check the time even in dark places.
Furthermore, it has basic features such as water resistance to 20 bar and shock resistance, and its well-balanced design makes it suitable for daily use. Its reasonable price makes it the perfect introduction to G-SHOCK radio-controlled solar models.
GMW-B5000D-1JF
Tough Solar. Runs for approximately 22 months on a full charge (power save mode). Stainless steel case (49.3mm x 43.2mm, 13mm thick). Water resistant to 20 bar. Price: 84,700 yen (tax included).
The full-metal GMW-B5000D-1JF is a model that recreates the traditional square design with a luxurious stainless steel case and bracelet.
Equipped with Bluetooth connectivity, it can be connected to a smartphone, making it easy to set the time and adjust alarms anywhere in the world.
Equipped with Tough Solar and Multiband 6, it maintains accurate timekeeping while reducing the hassle of maintenance. It also boasts high levels of shock resistance and water resistance, making it suitable for a wide range of occasions, from business to casual.
Equipped with a high-definition LCD screen, it ensures high visibility from various angles, making it a powerful model that combines style and functionality.
GMW-BZ5000GD-9
Tough Solar. Approximately 22 months on a full charge (power save mode). Stainless steel case (49.3mm x 43.6mm, 13mm thick). Water resistant to 20 bar. Price: 102,300 yen (tax included).
The GMW-BZ5000 is a model released in 2025 from the aforementioned "full metal" G-SHOCK. While retaining the iconic square shape of the "5000," a model descended from the original G-SHOCK, known as the "origin," it features a new case structure utilizing generative AI. This new case, created using shock resistance data accumulated over more than 40 years and load simulations by generative AI, realizes the complex design of the case side by connecting the bezel and center case at the top and bottom.
The key feature is the highly readable MIP (Memory In Pixel) LCD. Of course, it also comes equipped with Tough Solar and Multiband 6, making it not only a unique but also a very convenient G-SHOCK.
MTG-B3000D-1AJF
Tough Solar. Operates for approximately 18 months on a full charge (power save mode). Carbon fiber and stainless steel case (51.9mm x 50.9mm, 12.1mm thick). Water resistant to 20 bar. Price: 143,000 yen (tax included).
The MTG-B3000D-1AJF, an evolution of the MTG series, is designed to be thin and lightweight while achieving high levels of robustness and functionality.
The Dual Core Guard structure makes it approximately 9mm thinner and 148g lighter than the previous model. Equipped with Bluetooth connectivity, it can be connected to a smartphone for easy time adjustment and world time setting.
The carbon monocoque case provides both shock resistance and a comfortable fit. The sporty yet luxurious design, which combines metal and resin, is suitable for both outdoor and everyday use.
MTG-B2000B-1A2JF
Tough Solar. Operates for approximately 29 months on a full charge (power save mode). Carbon fiber and stainless steel case (55.1mm x 49.8mm, 15.9mm thick). Water resistant to 20 bar. Price: 143,000 yen (tax included).
The MTG-B2000B-1A2JF is a model that combines rugged durability with a sophisticated design.
The monocoque case, made of a combination of carbon-reinforced resin and metal, offers enhanced shock resistance while remaining lightweight. The design, which combines a blue dial with a black bezel, creates a sporty yet sophisticated atmosphere. Equipped with Bluetooth connectivity for smartphones and a world time function, it is also highly practical.
MRG-BF1000R-1AJR
Tough Solar. Operates for approximately 29 months on a full charge (power save mode). Ti case (56mm x 49.7mm, 18.6mm thick). Water resistant to 20 bar. Price: 594,000 yen (tax included).
The MRG-BF1000R-1AJR is a model that brings together the finest materials and technology in the MR-G series, which represents the pinnacle of G-SHOCK. The titanium case is treated with a unique "deep hardening process" that combines high scratch resistance with a beautiful texture.
The bezel is finished using traditional Japanese sword-making techniques, highlighting its unique design. Equipped with Multiband 6, it can display accurate time in any region.
Although it is priced on the high side, it is highly regarded by collectors and watch enthusiasts as the ultimate model that embodies the best of G-SHOCK technology.
The evolution and appeal of the G-SHOCK radio-controlled solar model
The radio-controlled solar-powered model has undergone continuous evolution since its birth. Thanks to innovations in watch technology and the pursuit of practicality, it has established itself as an essential item for modern lifestyles.
The latest solar-powered radio-controlled watches offer not only the basic functionality of traditional watches, but also advanced features such as smartphone connectivity and GPS. These features allow you to display accurate time anywhere in the world and manage a variety of information. Furthermore, models using carbon and titanium materials have been released that combine strength and lightness.
In terms of design, it is characterized by a wide variety of options, from classic square faces to modern analog displays.
What's particularly noteworthy is that these advancements have been made without sacrificing basic performance. The fundamental principles of G-SHOCK, such as shock resistance and water resistance, remain firmly established in the latest models. Furthermore, improvements to basic functions, such as more efficient solar charging systems and improved radio wave reception sensitivity, have also been steadily implemented.
Radio-controlled solar-powered models will continue to evolve to meet the needs of the times. However, their essential values of "toughness" and "accurate timekeeping" will remain unchanged. This is the true appeal of G-SHOCK radio-controlled solar-powered models.
