Casio G-Shock GD100-1B | Men’s Tough Digital Watch | 200M

Product Overview

The Casio G-Shock GD100-1B is a rugged, high-visibility digital watch engineered for those who demand reliability in extreme conditions. Built with military-grade toughness, this all-black timepiece combines shock resistance, 200-meter water resistance, and a long-lasting 7-year battery life to deliver unmatched durability. Designed for professionals in law enforcement, military personnel, athletes, and outdoor adventurers, the GD100-1B excels in environments where performance and visibility are critical. Its bold, large-format display and Super Illuminator high-brightness LED ensure effortless readability, even in total darkness. Whether you’re navigating challenging terrain or managing a demanding schedule, this watch is built to keep up with your toughest challenges.

Key Features

• Super Illuminator High-Brightness LED – This advanced lighting system delivers exceptional visibility in low-light or nighttime conditions, illuminating the entire display with a powerful, evenly distributed glow. Unlike standard backlights, the Super Illuminator ensures that every digit and function remains clearly legible, making it ideal for tactical operations, night training, or outdoor exploration after dark. The LED activates instantly with a simple button press, providing reliable illumination when you need it most.
• 200M Water Resistance – Engineered for aquatic environments, the GD100-1B offers professional-grade water resistance up to 200 meters (656 feet), making it suitable for swimming, snorkeling, and surface water sports. The reinforced case and secure sealing system protect internal components from water, dust, and debris, ensuring consistent performance in wet or humid conditions. This level of protection makes it a dependable companion for divers, surfers, and anyone working near or in water.
• Shock-Resistant Construction – Built on Casio’s legendary G-Shock platform, this watch is rigorously tested to withstand impacts, drops, and vibrations. The internal structure absorbs shock from all directions, protecting the module and ensuring accuracy even after hard knocks. Whether you’re on a construction site, in combat training, or hiking rugged trails, the GD100-1B maintains precision and functionality under pressure.
• Dual Time & World Time Functions – Stay synchronized across multiple time zones with the dual time feature, which allows you to monitor two different times simultaneously—perfect for frequent travelers or professionals coordinating with teams abroad. The world time function includes coverage for 29 time zones and 48 cities, enabling quick reference to global schedules. This makes the watch ideal for international business, military deployments, or adventure travel.
• 1/100-Second Stopwatch & Countdown Timer – Precision timing tools support athletic training, workout routines, and mission-critical operations. The stopwatch measures elapsed time with 1/100-second accuracy, while the countdown timer helps manage intervals, rest periods, or operational deadlines. Both functions feature audible alerts and are easily accessible through intuitive button controls.
• Five Daily Alarms – Never miss a critical moment with five independently programmable alarms that can be set for specific times each day. Whether reminding you of meetings, medication schedules, or training sessions, these alarms provide reliable notifications with a loud, attention-grabbing tone. The hourly time signal adds an extra layer of time awareness throughout the day.

Technical Specifications

• Model Number: GD100-1B
• Dimensions: 1 x 1 x 1 inches; 2.5 ounces – Compact and lightweight for comfortable all-day wear
• Battery: 1 Lithium Metal battery (included) – Delivers up to 7 years of continuous operation
• Water Resistance: 200 meters (656 feet) – Suitable for swimming and snorkeling
• Shock Resistance: Yes – Tested to withstand impacts from all angles
• Display Type: Digital with high-visibility LED backlight
• Time Features: Dual time, world time (29 time zones, 48 cities), 1/100-second stopwatch, countdown timer, 5 daily alarms, hourly signal
• Manufacturer: Casio
• ASIN: B003URSIKO
• Date First Available: October 4, 2010
• Department: Watches
• Best Sellers Rank: #42,611 in Clothing, Shoes & Jewelry; #74 in Men’s Wrist Watches
• Customer Rating: 4.7 out of 5 stars (based on 1,991 reviews)
• Warranty: Manufacturer’s warranty available upon request from customer service

Benefits & Uses

The Casio G-Shock GD100-1B is more than a watch—it’s a tactical tool designed for high-stakes environments. Its rugged build and advanced functionality make it ideal for military and law enforcement personnel who require dependable gear in the field. Athletes and fitness enthusiasts benefit from precise timing features and durable construction that withstands intense workouts. Outdoor adventurers appreciate the water resistance and shock protection during hiking, camping, or water-based activities. Frequent travelers rely on dual time and world time functions to stay organized across time zones. With minimal maintenance required and a 7-year battery life, this watch offers long-term reliability for professionals and enthusiasts alike.

Why Choose This Product

The G-Shock GD100-1B stands out as a premium choice for those who refuse to compromise on durability, visibility, and functionality. Its high-brightness LED, military-inspired design, and comprehensive timekeeping tools make it a top performer in demanding situations. Backed by Casio’s reputation for excellence and a strong customer rating, this watch delivers exceptional value and peace of mind. Whether you’re on duty, in training, or exploring the unknown, the GD100-1B is engineered to keep time—no matter what.