Casio B640WB-1AEF specifications

Casio B640WB-1AEF
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Casio B640WB-1AEF specifications, prices, product images and videos.

Casio B640WB-1AEF specifications

Below you will find the product specifications and the manual specifications of the Casio B640WB-1AEF.

Brand Casio
Model B640WB-1AEF | B640WB-1AEF
Product Watch
Language English
Filetype EN - 3 (PDF)
Technical details
Mechanism type Electronic
Watch dial type -
Water resistant depth 50 m
Timer 1/1s - 24h
Alarm function
LED backlight
Accuracy 30 sec/month
Snooze function
Clock mode 12h/24h
Watch type Bracelet watch
Watch case material Resin
Housing colour Black
Band material Stainless steel
Band main colour Black
Watch glass type -
Case shape -
Watch dial main colour Grey
Watch marker style Arabic numerals
Product design Sport
Battery type CR2016
Battery life 3 year(s)
Number of batteries supported 1
Weight & dimensions
Width 35 mm
Depth 38.9 mm
Height 9.4 mm
Weight 44 g
Other features
Dimensions (WxDxH) 35 x 38.9 x 9.4 mm
Product colour Black
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LED light

A light-emitting diode (LED) is used to illuminate the watch face.


A light diode flashes as soon as an alarm, a countdown-time or the hour signal has been reached.

Stopwatch function - 1/100 sec. - 24 hours

Elapsed time, split time and final time are measured with 1/100-sec accuracy. The watch can measure times of up to 24 hours.

Timer - 1/1 sec. - 24 hours (with automatic repeat)

For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. They then count back automatically from the preset time. The time can be set to the nearest second and up to 24 hours in advance - Ideal for people who need to take medicines every day or those who do interval training.

Multi alarm

This model is equipped with a multifunctional alarm. One of these alarms is a snooze alarm. This clock has the perfect alarm for any type of appointment. The model is equipped with a total of four repeat alarms: 1. Daily alarm, sounds at the same time each day, 2. Date alarm, e.g. to help you remember birthdays, 3. Monthly alarm, sounds on the same day at the same time each month, 4. Alarm for every day of a particular month.

Automatic calendar

Once set, the automatic calendar always displays the correct date.

12/24-hour timekeeping

Times can be displayed in either a 12-hour or 24-hour format.

Resin case

Stainless steel band

Tough, durable and elegant: The stainless steel wrist strap gives your watch that classic feel.

Adjustable fastening

The clasp can be individually adjusted extremely easily for maximum comfort.

3 Years - 1 Battery

The battery supplies the watch with sufficient energy for approx. three years.

Water resistance classification (5 bar)

This watch can be worn when showering and bathing - it is tested for water resistance up to 5 bar / 50 metres. The metres value does not relate to a diving depth but to the air pressure used in the course of the water resistance test. (ISO 2281)


+/- 30 sec seconds per month

Type of battery