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About this item
- 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
- Elapsed time, split time and final time are measured with 1/100-sec accuracy
- The watch can measure times of up to 24 hours
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From the manufacturer
The CASIO Collection — Beautifully retro
The cult following for the shape, function and colour of the first CASIO digital watch from the 1980s is more up-to-date than ever thanks to the watches in the retro Collection. With warm shades of gold, cool stainless steel and black plastic, these timeless design icons can be combined perfectly with modern style. It's good to know that some things never change.
Display illumination
The watch dial or display illuminates at the touch of a button, helping you to see everything, even in absolute darkness.
Alarm Function
The daily alarm reminds you about recurring events with an acoustic signal at the time you have set.
Waterproof up to 5 bar
Taking a shower or bath with this watch is not a problem. It has been tested for water resistance up to 5 bar/50 metres.
Product specifications
Watch Information
Brand, Seller, or Collection Name | Casio |
---|---|
Model number | B640WB-1ADF |
Part Number | B640WB-1ADF |
Model Year | 2011 |
Item Shape | Square |
Dial window material type | Mineral |
Display Type | Digital |
Clasp | Buckle |
Metal stamp | 10k |
Case material | Resin |
Case diameter | 35 millimeters |
Case Thickness | 8 millimeters |
Band Material | Stainless Steel |
Band size | 10 |
Band width | 20 millimeters |
Band Color | Black |
Dial color | Black |
Bezel material | Kunststoff |
Calendar | Day-Date-Month |
Special features | stop watch^countdown^alarm^back light |
Item weight | 4.23 ounces |
Movement | Quartz |
Water pressure resistance | 5 bar |
Water resistant depth | 50 Meters |
Warranty | If this product is sold by Amazon, please review the manufacturer’s website for warranty information. If this product is sold by another party, please contact the seller directly for warranty information for this product. You may also be able to find warranty information on the manufacturer’s website. |
Product details
- Is Discontinued By Manufacturer : No
- Product Dimensions : 1.53 x 1.38 x 0.37 inches; 4.23 ounces
- Item model number : B640WB-1ADF
- Department : men
- Batteries : 1 Lithium Metal batteries required. (included)
- Date First Available : March 29, 2012
- Manufacturer : CASIO
- ASIN : B007421JGG
- Best Sellers Rank: #617,382 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry)
- #3,470 in Men's Wrist Watches
- Customer Reviews:
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Casio B640 Watch Review
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Customer Review: Expensive casio but worth it
Devang & Kinjal
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the quality, appearance and accuracy of the watch. For example, they mention it's a great every day watch, it looks amazing on a 5 inch wrist and that it keeps accurate time. That said, opinions are mixed on fit, backlight, value, and readability.
AI-generated from the text of customer reviews
Customers like the quality of the watch. They say it's a decent watch, awesome, and a great everyday watch. Customers also like the band and case, and mention it'll get lots of compliments.
"It looks good and Casio watches always delivered a long lasting life for me..." Read more
"Very good!" Read more
"I have worn a Casio digital watch for many years. They are durable, inexpensive, and reasonably accurate...." Read more
"...For what it's worth, this is a decent watch if you're outside or in daylight a lot, but since I work indoors most of the time, I found that trying..." Read more
Customers are satisfied with the appearance of the watch. They mention it's good looking, amazing on a 5 inch wrist, and has a simple design. The display is sharp and clear, and it matches with everything.
"It looks good and Casio watches always delivered a long lasting life for me..." Read more
"...The display is sharp and clear, and is much more akin to the classic DW5600 - you get full day and date display..." Read more
"...Otherwise it looks really cool and has all the functions I need like a 24 hour stopwatch, and countdown timer...." Read more
"...This particular Casio digital watch is nicely styled and clearly presents the time, day, and date on an easy to read screen...." Read more
Customers like the accuracy of the watch. For example, they say it's the best for keeping accurate time, it clearly presents the time, day, and date on an easy to read display. That said, they mention that setting up the time was fast and easy. They also appreciate the full day and date display, as well as the countdown timer. Overall, customers are happy with their purchase and recommend it to others.
"...thing: while in timer and stopwatch mode, this watch keeps the time of day displayed; this is something that none of the more expensive G-Shocks do,..." Read more
"...and has all the functions I need like a 24 hour stopwatch, and countdown timer...." Read more
"...bottom button it makes a buzzing sound (see the video) but I cannot set the time...." Read more
"...This particular Casio digital watch is nicely styled and clearly presents the time, day, and date on an easy to read screen...." Read more
Customers are mixed about the fit of the watch. Some mention that it fits great, has a small wrist, and is lite. Others say that it's pretty small for most above-average guys and is very small face watch.
"...Is a little slim, maybe you like that and maybe you dont.I kinda expected more from a 50usd watch, not sure what exactly...." Read more
"...it out for the resin strap from an F91-W (pictured), and it fits perfectly." Read more
"Love it and I use it every day. Only con is the band because it's bulky and it pulls on your wrist hairs sometimes (like once a week)...." Read more
"The watch is small tho compare with one cold" Read more
Customers are mixed about the backlight of the watch. Some mention that it has an awesome full-screen orange backlight that stays for about 2.5 hours. However, others say that the screen is in non-color, the back light is orange, and the display light is grey.
"...form factor is closest to the F91-W, this watch has a great full-screen orange backlight which stays for about 2.5 seconds, unlike those cheaper..." Read more
"...The backlight is orange. Don't think I can return as I scuffed it during the first time wearing it." Read more
"...The switchable back light makes it easy to see in total darkness. It's easy to change the settings...." Read more
"...classier look, true 4-button operation, a countdown timer, an awesome backlight, an alarm that can be set for a specific day, auto calendar, and the..." Read more
Customers are mixed about the value of the watch. Some mention it's very good value for your money, while others say it'll not worth the price.
"...Way too expensive for this watch. It shouldn't cost no more than $15.00 dollars tops." Read more
"I have worn a Casio digital watch for many years. They are durable, inexpensive, and reasonably accurate...." Read more
"This watch is much smaller and more expensive than the compatible ones in Walmart. The band was the only nice thing about it." Read more
"Its a great watch deffinetly worth the price...." Read more
Customers are mixed about the readability of the watch. Some mention that it's very easy to read, presents the time, day, and date on an easy to see screen, while others say that the display is a little difficult to read and the whole screen isn't that clear.
"...is nicely styled and clearly presents the time, day, and date on an easy to read screen...." Read more
"...band is shine, other than that it’s cool and also it kind of hard to read the time." Read more
"...It’s simple and I was looking for something that would be durable, so of course I looked into CasioOverall, a pretty good purchase" Read more
"...Doesn't look like the one advertised, the whole screen isn't that clear....." Read more
Customers are not satisfied with the clasp of the watch. They mention that it's faulty, the strap latch is iffy, and the watch falls off. Some say that the clasp was not secure like their previous watch and that they had to return it.
"...I ordered this watch I was able to wear for a day and then the clasp snapped, and I had to return it. I got a replacement today...." Read more
"I love the watch and totally recommend it EXCEPT that the clasp always comes loose and the watch falls off of my wrist a lot...." Read more
"Great Watch! Strap latch is iffy." Read more
"...The latch was not secure like my previous watch and they will not provide a refund. Do not buy from this 3rd party seller!" Read more
Reviews with images
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Top reviews
Top reviews from the United States
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Is a little slim, maybe you like that and maybe you dont.
I kinda expected more from a 50usd watch, not sure what exactly. 35-38usd is what I think this may worth.
First: in terms of size, this watch is most akin to the F91-W (see photo for comparison), which I love - it wears light and thin against the wrist, keeping the small size of the 91-W while having a nice rounder side-design.
The display is sharp and clear, and is much more akin to the classic DW5600 - you get full day and date display (the F91-W gives only the date and day of the month, not the month itself); also, like the DW5600 and DW290, this has the full basic-module set of functions: alarm, countdown timer, stopwatch (F91-W lacks the timer, which always bugged me). Another thing: while in timer and stopwatch mode, this watch keeps the time of day displayed; this is something that none of the more expensive G-Shocks do, and yet, here it is.
Bringing functionality I'd seen only in the DW290, this watch also has the auto-repeat option for the timer - so nice if you're doing things on an interval and don't want to have to keep restarting the alarm. It's a small thing, but it's great to have.
Finally, even though the form factor is closest to the F91-W, this watch has a great full-screen orange backlight which stays for about 2.5 seconds, unlike those cheaper models, and the clasp is comfortable and easy to adjust. Just a great watch.
Update, one week later: This isn't enough to knock a star off, but the metal bracelet is kind of crappy. I switched it out for the resin strap from an F91-W (pictured), and it fits perfectly.
Reviewed in the United States on July 2, 2020
First: in terms of size, this watch is most akin to the F91-W (see photo for comparison), which I love - it wears light and thin against the wrist, keeping the small size of the 91-W while having a nice rounder side-design.
The display is sharp and clear, and is much more akin to the classic DW5600 - you get full day and date display (the F91-W gives only the date and day of the month, not the month itself); also, like the DW5600 and DW290, this has the full basic-module set of functions: alarm, countdown timer, stopwatch (F91-W lacks the timer, which always bugged me). Another thing: while in timer and stopwatch mode, this watch keeps the time of day displayed; this is something that none of the more expensive G-Shocks do, and yet, here it is.
Bringing functionality I'd seen only in the DW290, this watch also has the auto-repeat option for the timer - so nice if you're doing things on an interval and don't want to have to keep restarting the alarm. It's a small thing, but it's great to have.
Finally, even though the form factor is closest to the F91-W, this watch has a great full-screen orange backlight which stays for about 2.5 seconds, unlike those cheaper models, and the clasp is comfortable and easy to adjust. Just a great watch.
Update, one week later: This isn't enough to knock a star off, but the metal bracelet is kind of crappy. I switched it out for the resin strap from an F91-W (pictured), and it fits perfectly.
Top reviews from other countries
Reviewed in Sweden on April 21, 2023
A ver, no os flipeis, es un reloj Casio, esfera pequeña, de resina, i cadena de acero, TAL Y COMO ERAN ORIGINALMENTE. No penseis que por 40 € aprox. vais a tener un reloj de acero que os mide los biorritmos por que ni es su propósito ni lo hacian originalmente. Eso si, nostalgia la que quieras.
Reviewed in the Netherlands on August 31, 2021