G-SHOCK GD-100-1BDR

The Casio G-Shock GD-100-1BDR is a men’s digital watch that combines a rugged, classic black design with a high-brightness LED backlight for superior visibility. It is known for its durability, water resistance, and long battery life. The “-1B” in the model name indicates the black case and band with a negative (dark) digital display.
Specifications
Case size (L× W× H): 55 × 51.2 × 17.4 mm.
Weight: 72 g.
Construction: Shock Resistant resin case and bezel.
Water resistance: 200-meter.
Power supply: Approximately 7 years on a CR2025 battery.
Display: Digital LCD with a negative (dark) display.
Lighting: High-brightness LED backlight (Super Illuminator) with afterglow.
Other features:
Multi Time: Can display the time in 4 different cities.
World Time: 31 time zones (48 cities + coordinated universal time).
Stopwatch: 1/100-second stopwatch with various measuring modes.
Countdown Timer: Measures in 1/10-second increments up to 24 hours.
Alarms: 5 alarms (daily or one-time) with flash alert.
Full auto-calendar (to year 2099).
12/24-hour format.