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The Casio F-91WM-1BDF runs on a module 593 quartz movement inside a 21-gram resin frame. It tracks time, date, and daily alarms with ±30 seconds monthly accuracy. This version replaces the matte black finish of the original F-91W-1 with a metallic gunmetal grey case.
Key Features
- 7-Year Battery Life: CR2016 lithium cell provides long-term electronic power. Runs for 84 months without requiring a back-case opening.
- 21g Ultra-Lightweight Design: Resin strap combined with a 38.2mm wide resin case. Avoids wrist fatigue during high humidity BD commutes.
- 3-Year Official Warranty: Coverage for the internal module 593 electronic components. Protects against circuit failure or display faults.
- ±30 Seconds Monthly Accuracy: High-precision quartz timing mechanism for reliable timekeeping. Drift stays under one minute every sixty days.
- Resin Glass Lens: Transparent impact-resistant cover for the digital display. Resists shattering from drops but picks up surface scratches.
- Hourly Time Signal: Audible beep at the start of every hour. Provides a sound cue without checking the screen.
Frequently Asked Questions
Is Casio F-91WM-1BDF waterproof?
The watch resists splashes and light rain. Submerging the case or pressing buttons underwater leads to seal failure.
How long does Casio F-91WM-1BDF battery last?
The CR2016 lithium cell powers the watch for 7 years. Frequent use of the green LED backlight reduces this timeframe.
