Casio PRJ-B001-1

Embrace the spirit of ultralight trekking with the Casio PRO TREK PRJ-B001-1. Engineered as the lightest model in the entire PRO TREK lineup (weighing in at a featherlight 44 g as of July 2024), this trail-ready timepiece blends sustainable bio-based materials, solar autonomy, and smart tracking into a stealthy charcoal gray package with vibrant fluorescent accents.

The defining characteristic of the PRJ-B001 series is its innovative Rotary Guard Bezel. With a quick 45-degree turn, you can switch between an angular aesthetic that covers the buttons to prevent accidental presses around town, and a rounded profile that uncovers the pushers for instant access to functionality while wearing gloves or navigating tough trails.

Key Features

• Rotary Guard Bezel: A dual-style rotating bezel frame that lets you toggle between a sleek angular urban mode (blocking button presses) and an accessible rounded trail mode (uncovering pushers).
• Ultralight Bio-Based Build: Crafted using eco-conscious bio-based resins in the case and soft urethane band, minimizing environmental impact while delivering stress-free comfort over long-distance hikes.
• Tough Solar Power System: Converts ambient sunlight and indoor fluorescent light into electrical energy, delivering up to 7 months of normal operation (or 18 months in total darkness under Power Saving mode).
• Bluetooth Smartphone Link: Pairs wirelessly with the CASIO WATCHES app for automatic time adjustments, easy settings configuration, and access to over 300 World Time cities.
• GPS "Time & Place" Activity Log: Press a button on the watch to log your exact geographic coordinates, date, and time onto a visual map inside the smartphone app—perfect for tracking trail milestones.
• Low-Temperature Resistance: Engine-rated to keep performing reliably even in harsh freezing conditions down to -10°C.
• Double Super Illuminator LED: Equipped with high-brightness white LEDs for both the analog face and digital LCD screen, paired with Neobrite luminous hands for superior night navigation.

Specifications at a Glance

• Case Size: 50.3 × 46.0 × 13.6 mm
• Weight: Ultra-light 44 g
• Case / Bezel Material: Resin / Bio-Based Resin
• Band Material: Bio-Based Soft Urethane (Fits 145 to 215 mm wrists)
• Glass: Scratch-Resistant Mineral Glass
• Water Resistance: 100 Meters (10 Bar)
• Thermal Resistance: Low-Temperature Resistant (-10°C)
• Power Supply: Tough Solar Charging System
• Accuracy: ±15 seconds per month (without smartphone link)