The Casio Pro Trek PRJ-B001EX-1 (cataloged within the innovative Pro Trek Hiker Line) is a cutting-edge, lightweight Japanese solar-powered analog-digital outdoor timepiece. Designed specifically for backpackers, campers, and day-hikers who value ultralight comfort and clever utility, this special "EX" edition includes a versatile, reversible storage band engineered to hold small items like coins, keys, or parking tickets during outdoor excursions. Across international outdoor gear forums and Pro Trek collector circles, it has earned defining community nicknames—the "Rotary Guard Hiker", "Coin Pouch Pro Trek", "Ultralight Hiker EX", or simply the "PRJ-B001EX". It earns these names for its pioneering switchable rotary bezel guard, sustainable biomass plastic construction, and inventive modular strap system. It unites a lightweight case fashioned from eco-friendly biomass plastics measuring 46.0mm in width (with a low-profile case shape designed to prevent wrist-bone interference) with a high-contrast analog-digital face, mineral crystal glass, an in-house Japanese Bluetooth quartz engine, and an integrated modular strap. Weighing an ultra-light 38.0 grams (watch head only), it is meticulously calibrated for hikers and urban explorers seeking an agile, feature-packed outdoor companion.

The defining visual centerpiece of this PRJ-B001EX-1 reference is its Switchable Rotary Guard Bezel and Reversible Storage Band. The watch introduces Pro Trek's first-ever rotary guard bezel: in its standard angular position, the bezel covers the side push-buttons to prevent accidental activation during rigorous activity or everyday wear; rotated 45 degrees, it reveals a rounder profile and grants full, effortless access to the buttons for trail operation. The special "EX" package includes a unique reversible fabric and resin band featuring an integrated small storage pouch. This pouch can store coins or tokens for campsite purchases, fold over to protect the watch crystal during rough transit, or detach so the watch can be clipped to a backpack or tent loop via a carabiner. Turning the watch over reveals a solid biomass resin caseback stamped with Pro Trek's mountain summit emblem.

Beneath its adaptable exterior, the watch is driven by Casio’s advanced in-house Japanese analog-digital quartz engine featuring Tough Solar power. The solar-charging system converts natural sunlight and ambient indoor illumination into electrical energy, storing it in a secondary rechargeable battery and entirely eliminating periodic battery replacements. On a full charge, the caliber delivers approximately 7 months of normal operation with active functions, and up to 18 months in Power Saving Mode when stored in total darkness.

Punctuality and outdoor logging are managed by an energy-efficient Bluetooth Mobile Link system. By pairing wirelessly with the CASIO WATCHES smartphone application, the watch performs automatic time synchronization, configures world time across 38 global cities, and unlocks the Time & Place Memory feature. By pressing a button on the watch while exploring, you can instantly record your current GPS coordinates and timestamp into the app's map, creating a detailed action log of your journey to revisit later or share with friends.

The watch is built using renewable biomass plastics derived from organic castor oil and corn for all major resin components, lowering ecological impact while maintaining rugged durability. The case features a sloped design on the back side to reduce interference with the back of the hand, ensuring a comfortable fit during long trail hikes. Dial protection is provided by a scratch-resistant flat mineral crystal glass. Engineered for outdoor exploration, the case secures a certified 10-bar (100 meters / 330 ft) water resistance rating, making it safe for swimming, rain, and river crossings.

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