Casio F-91WS-7EF

- Weight: 21 g
 
- 38.2 × 35.2 × 8.5 mm
 
- Approximate battery life: 7 years with CR2016
 
- Water repellent

- Case and bezel material: Resin / chrome-plated

- Accuracy: ±30 seconds per month

Functions:
- Stopwatch
- Illumination (green)
- calendar
- Alarm / hourly time signal