The Casio F-91WM-7A is a lightweight digital watch designed with a casual aesthetic, featuring a durable resin case, bezel, glass, and resin band.

Equipped with an integrated LED light with a green display, this water-resistant timepiece provides reliable visibility in dark conditions.

Core functionality includes a 1/100-second stopwatch, daily alarm, hourly time signal, auto-calendar set for February, and an approximate 7-year battery life on a CR2016 battery.

Key Features

Case size (L× W× H)	38.2 × 35.2 × 8.5 mm
Weight	21 g
Case and bezel material	Resin
Band	Resin Band
Water resistance	Water Resistant
Power supply and battery life	Approx. battery life: 7 years on CR2016
Glass	Resin Glass
Stopwatch	1/100-second stopwatch Measuring capacity: 59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place times
Alarm/hourly time signal	Daily alarm, Hourly time signal
Light	LED light
Light color	LED:Green
Calendar	Auto-calendar (set at 28 days for February)
Accuracy	Accuracy: ±30 seconds per month
Other features	12/24-hour format, Regular timekeeping: Hour, minute, second, pm, date, day

Highlights

Lightweight
Water resistant
Easy to see in darkness
Casual design

Downloads

Operation Guide

Frequently asked questions

What are the dimensions and weight of this watch?

The watch measures 38.2 × 35.2 × 8.5 mm and weighs 21 g.

What materials are used for the case and band?

The case, bezel, glass, and band are all constructed from resin.

What is the expected battery life?

The watch offers an approximate battery life of 7 years on a CR2016 battery.

What stopwatch functions are included?

It includes a 1/100-second stopwatch with a measuring capacity of 59'59.99'' supporting elapsed time, split time, and 1st-2nd place times.

Does the watch feature backlighting?

Yes, it features a green LED light for visibility in darkness.

What is the accuracy of the watch?

The accuracy is ±30 seconds per month.

Casio Classic Black Dial Digital Watch F-91WM-7ADF