The Casio B640WC-5ADF is a classic digital watch that combines Casio’s popular retro styling with practical everyday functionality. The model features a brown-gold finish, a stainless steel band with an adjustable clasp, and a compact resin case with partial ion plating. Designed for comfortable everyday wear, it offers 50-meter water resistance, a 1/100-second stopwatch, 24-hour countdown timer with auto-repeat, multi-function alarm, flash alert, and amber LED backlight. With a full auto-calendar and approximately 3-year battery life, the B640WC-5ADF delivers vintage-inspired styling with dependable digital performance.
Key Features
Classic retro digital design
Brown-gold color scheme
Stainless steel band
Adjustable clasp
Resin case and bezel
Partial ion-plated surface treatment
50-meter water resistance
1/100-second stopwatch
24-hour countdown timer
Auto-repeat timer
Multi-function alarm
Hourly time signal
Flash alert
Amber LED backlight
Full auto-calendar to 2039
12/24-hour time format
Approximately 3-year battery life
Case & Bezel
Case and bezel material: Resin
Surface treatment: Partial ion plated
Glass: Resin Glass
Compact retro-style case
Classic rectangular digital design
Dial & Display
Full digital display
Regular timekeeping displays:
Hour
Minute
Second
PM
Month
Date
Day
12/24-hour time format
Full auto-calendar to year 2039
Band
Stainless steel band
Adjustable clasp
Self-adjustable design for convenient sizing
Water Resistance
50-meter water resistance
Rated to 5 bar
Timekeeping
Digital quartz timekeeping
Hour, minute, second, PM, month, date and day
12/24-hour time format
Full auto-calendar to year 2039
Accuracy: ±30 seconds per month
Stopwatch & Timer
1/100-second stopwatch
Measuring capacity:
00'00"00 to 59'59"99 for the first 60 minutes
1:00'00 to 23:59'59 after 60 minutes
Measuring unit:
1/100 second for the first 60 minutes
1 second after 60 minutes
Elapsed time measurement
Split time measurement
1st and 2nd place times
Countdown timer
Measuring unit: 1 second
Countdown range: Up to 24 hours
Start time setting: 1 second to 24 hours
1-second, 1-minute and 1-hour setting increments
Auto-repeat function
Alarm & Additional Functions
Multi-function alarm
Hourly time signal
Flash alert
Display flashes together with the buzzer for alarms and the hourly time signal
Full auto-calendar to 2039
12/24-hour time format
Illumination
LED backlight
Afterglow
Amber LED light
Designed for improved visibility in dark environments
Power & Battery
Battery-powered digital quartz timekeeping
CR2016 battery
Approximate battery life: 3 years
Dimensions & Weight
Case Size: 38.9 × 35 × 9.4 mm
Weight: Approximately 49 g
Ideal For
Suitable for:
Everyday wear
Casual and lifestyle use
Retro and vintage-inspired outfits
Unisex styling
Users looking for a compact digital watch
Users who prefer an adjustable stainless steel bracelet
Casio Vintage enthusiasts
What's Included
Casio B640WC-5ADF Digital Watch
Casio presentation packaging
User documentation
Warranty documentation, where applicable
All technical specifications above are based on Casio's official documentation for the B640WC-5A.
