The Casio AQ-S820W-5DF-B is a rugged analog-digital sports watch powered by Casio Tough Solar technology, eliminating the need for regular battery replacements. Inspired by aircraft instrument panels, it features bold analog hands paired with a digital display for quick access to world time, alarms, timers, and stopwatch functions. With 100-meter water resistance, dual countdown timers, and a lightweight resin construction, it's an excellent choice for sports, travel, and everyday use.
Key Features
Tough Solar (solar-powered rechargeable battery)
100-meter water resistance (10 Bar)
Analog-digital display
World Time (48 cities / 31 time zones)
Dual countdown timers
1/100-second stopwatch
5 daily alarms
LED backlight with afterglow
Full auto calendar (to year 2099)
Battery level indicator
Power Saving mode
Button operation tone on/off
12/24-hour time format
Tough Solar Technology
Solar-powered rechargeable battery
Charges from sunlight and indoor lighting
Battery level indicator
Power Saving mode automatically turns off the display in darkness to conserve energy
Approximate runtime after full charge:
10 months with normal use and no additional light exposure
23 months in total darkness with Power Saving enabled
World Time
31 time zones
48 cities + UTC
Daylight Saving Time (DST) on/off
Home City / World Time city swap
Timekeeping
Displays:
Hour
Minute
Second
Month
Date
Day of the week
PM indicator
12-hour or 24-hour format
Day display available in 6 languages:
English
Portuguese
Spanish
French
German
Italian
Stopwatch
1/100-second stopwatch
Measuring capacity: 59'59.99"
Measuring modes:
Elapsed time
Lap time
Split time
Countdown Timers
Dual countdown timers
Designed for interval training
Measuring unit: 1 second
Adjustable from 5 seconds to 99 minutes 55 seconds
Auto-repeat (1–10 repeats selectable)
Alarm Functions
5 daily alarms
Hourly time signal
Lighting
LED backlight
Amber LED
Selectable illumination duration:
1.5 seconds
3 seconds
Afterglow illumination
Calendar
Full Auto Calendar
Programmed until 2099
Design & Materials
Durable resin case
Comfortable resin strap
Resin glass
Aviation-inspired dial
High-contrast white hands for excellent readability
Combination analog and digital display
Colors
Case: Black
Bezel: Black
Band: Khaki/Brown Resin
Dial: Black with white hands and digital LCD display
LED Backlight: Amber
Note: The "5DF" variant features the khaki/brown resin strap and matching accents, while all specifications remain identical to the AQ-S820W series.
Water Resistance
100 meters (10 Bar)
Suitable for:
Swimming
Snorkeling
Water sports
Everyday wear
Not suitable for scuba diving.
What's Included
Casio AQ-S820W-5DF-B Watch
Original Casio Box
Instruction Manual
Warranty Card (provided by the authorized distributor)
