Casio W-800 — Classic Square Design with 10-year Battery

Rating: 5 out of 5.
Battery Years★★★★★
How did we compose this rating? Enjoy our calculations →

About W-800 in Short. 100M Water Resistance and 10-Year Battery life makes this watch the perfect choice for those looking for top cost performance in a timepiece.

General Information

Price$16  *average Amazon Price, we may earn commission from purchases
Year of First Release2007
Model RangeCasio Digital Collection
Battery Type CR2025 (Casio Batteries)
Manual3092 (official)

W-800 Model Range *may be updated

*Want to be the first to know about new Collection Updates? Here we store all recent Monthly Collection Updates →

Other Casio Digital W Watches *similar by price and functions but different by cases

These are not all Casio Digital W Series. Here is a list of All Casio Digital W Watches →

Casio W-800 Display Guide *for key functions only. For you to know how it works))


To set the time and date
1. In the Timekeeping Mode, hold down A until the seconds start to flash, which indicates the setting screen.
2. Press C to move the flashing to select other settings.
3. When the setting you want to change is flashing, press D to change it.
– Pressing D while the seconds are in the range of 30 to 59 resets them to 00 and adds 1 to the minutes. In the range of 00 to 29, the minutes are unchanged.
4. Press A to exit the setting screen.


The stopwatch lets you measure elapsed time, split times, and two finishes.
– The display range of the stopwatch is 23 hours, 59 minutes, 59.99 seconds.
– The stopwatch continues to run, restarting from zero after it reaches its limit, until you stop it.

Dual Time

  1. Press C to enter the Dual Time Mode
  2. In the Dual Time Mode, hold down A until the hour setting starts to flash, which indicates the setting screen.
  3. Press C to change the selection (Hour – (C) – Minutes)
  4. Press D to increase the setting.
  5. Press A to exit the setting screen.


The multi-function alarm lets you specify the hour, minutes, month, and day for the alarm. You can set up the alarm so it sounds once when the alarm time is reached, or for a snooze alarm that repeats up to seven times, every five minutes.
You can also turn on an Hourly Time Signal that causes the watch to beep twice every hour on the hour (pressing D).

Official W-800 Specs / Features *for base version W-800HG-9AV

  • Case / bezel material: Resin
  • Resin Band
  • Resin Glass
  • 100-meter water resistance
  • LED backlight
  • Dual time
  • 1/100-second stopwatch
    Measuring capacity: 23:59’59.99”
    Measuring modes: Elapsed time, split time, 1st-2nd place times
  • Multi-function alarm (One-time or 7-time snooze)
  • Hourly time signal
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Regular timekeeping: Hour, minutes, seconds, pm, year, month, date, day
  • Accuracy: ±30 seconds per month
  • Approx. battery life: 10 years on CR2025
  • Size of case : 44.2×36.8×13.4mm
  • Total weight : 37g

You ask, we answer…

What does 100-meter water resistance in W-800 mean?

The watch is good for swimming but not for deep diving.

What battery does W-800 have?

10 years CR2025.

What does Stopwatch in W-800 do?

Measuring capacity: 23:59’59.99”
Measuring modes: Elapsed time, split time, 1st-2nd place times.

4.5 2 votes
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Bill Brekke
Bill Brekke
1 year ago

This watch has a really excellent display. In particular the large three character day with a line around it is helpful. I’m retired?

tech deck feck
tech deck feck
1 year ago

ahem, W800H-1AV=pepis

6 months ago

A decent Casio,i had my Casio w-800 h for close to 8 years now and it’s held up really well,im still on the same battery when I purchased it. The module in the one I have is 3240,did they change the module on newer ones? I have had mine for 8 years but it was probably sitting in the store for a year or so before I bought it. It’s a great value watch for what you pay,IV always really liked it. Pros: -Large readable LCD -Large metal pushers (Buttons) -Great battery life -Time,date,year are displayed all the time on… Read more »