The Casio F-91WB-2A1EF is a lightweight and slim digital watch based on the classic F-91 model. This version features a minimalist face with minimal text and a monotone color scheme for a clean aesthetic. The band is constructed from biomass plastic, a sustainable material.

• Case dimensions: 38.2 x 35.2 x 8.5 mm
• Weight: 21 g
• Case and bezel material: Resin
• Band material: Resin (biomass plastic)
• Water resistance: Daily use water resistance
• Battery life: Approximately 7 years
• Stopwatch: 1/100 second, 60-minute timer, split time
• Alarm: Time alarm and hourly time signal
• Light: Green LED
• Calendar: Auto-calendar
• Accuracy: ±30 seconds per month
• Display: 12/24 hour format switching