While Casio is not primarily known for full-fledged smartwatches, the company has steadily blended its durable, time-tested designs with modern fitness and tracking features. The latest result of that approach is the G-SHOCK GBX-H5600KI-5, created in collaboration with pro surfer Kanoa Igarashi. This model leans on Casio’s G-SHOCK legacy—robust build, water resistance and a sporty aesthetic—while adding activity tracking and smartphone connectivity for users who want durability with smart features.
Casio says the design is inspired by the cliffs of Portugal, a training ground for Igarashi. That influence shows up in the two-tone resin bezel and band, complemented by ocean-themed lavender accents on the watch face. The colorway is subtle but distinctive, intended to evoke coastal scenery without overwhelming the classic G-SHOCK silhouette. The watch balances style and function: it looks like a rugged G-SHOCK at a glance but includes fitness-focused hardware and software under the hood.
Powering the device is a hybrid approach to energy. The GBX-H5600KI-5 includes a rechargeable battery for everyday use and also supports solar charging. Solar capability can extend time between charges and is particularly useful for outdoor users or situations where a wall outlet is not readily available. For owners who spend long stretches outside—on the water or in sunlight—this feature reduces one common pain point of wearable devices: frequent recharging.
On the fitness and tracking side, Casio partnered with Polar to integrate tried-and-tested fitness software. The watch includes an optical heart rate sensor for continuous heart rate monitoring, and it provides specific training analysis for activities like running and walking. Given the collaboration with a professional surfer and the ocean-inspired design, the GBX-H5600KI-5 also offers tide graph functionality and tools aimed at ocean activities. These sport- and outdoors-oriented features make the watch suitable for users who split their time between land-based workouts and water-based training.
Casio chose a high-contrast Memory-in-Pixel (MIP) LCD for the display, a decision that improves legibility in bright sunlight and can help with visibility underwater. Combined with a chassis rated for 200-meter water resistance, the screen and case are built for demanding conditions—swimming, surfing and rugged outdoor use. The case back has been updated to a carbon fiber-reinforced resin, which the company says reduces weight compared to the earlier DW-H5600 model. The lighter case contributes to comfort during prolonged wear while maintaining the durability G-SHOCK is known for.
Connectivity is handled via Bluetooth, enabling common smartwatch-style conveniences without turning the device into a full smartwatch. Users can link the watch to a smartphone to enable automatic time adjustments, configure activity tracking settings, and receive wrist notifications for incoming calls, emails and social updates. Calendar reminders and other notification types can be routed to the watch, making it easier to stay informed while on the move without relying on a phone in hand.
Functionally, this model aims to sit between a classic rugged watch and a modern fitness wearable. It emphasizes essentials—accurate timekeeping, robust construction, water resistance and reliable activity tracking—rather than attempting to replicate the broader app ecosystems of major smartwatch platforms. For buyers who prioritize toughness and simplicity with useful fitness features, that trade-off will likely be appealing.
In terms of price, the GBX-H5600KI-5 comes in at $370. That positions it nearer the price of mainstream smartwatches from larger platform makers, which offer deeper app ecosystems, larger touchscreens and more extensive sensor arrays. The premium here is partly for G-SHOCK durability, the specialized sport features, and the collaboration with a professional athlete. For users who need a rugged device that handles surf sessions, open-water training and daily workouts without sacrificing essential smart features, the cost may be justified. For those who want a broader smartwatch experience—apps, music streaming and richer third-party integrations—other devices may present better value.
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