Backlight, alarm and stopwatch features
All four pages list an LED amber backlight. The W-218H-3BV page adds a daily alarm, an hourly time signal and a 1/100-second stopwatch, which is the shortest feature list of the four.
Illumination is described in more detail on the W-221H-8AV page. It lists a selectable illumination duration of 1.5 or 3 seconds, with afterglow, and three multifunction alarms plus a snooze alarm. Casio describes the visibility of this model as “outstanding”, and that word is the brand’s own.
A snooze alarm is also listed on the W-221H-1BV page, next to three alarms in total. The MWD-110H-3AV page lists a daily alarm and an hourly signal, and its backlight comes with afterglow.
Men who set more than one alarm in a day will find the two W-221H pages the closest match, since the other two pages mention a single daily alarm. The stopwatch resolution on the W-221H-8AV page matches the one on the W-218H-3BV page.
Countdown, dual time and battery cells
Timekeeping is where the MWD-110H-3AV page is the most detailed. It lists a 24-hour countdown range, dual time, and an accuracy of plus or minus 30 seconds per month, all of them as brand statements.
Both W-221H pages describe a countdown and world time. Casio uses the phrase dual time on one model and world time on the others, so the two wordings are reported as the pages give them and are not treated as the same feature.
Three different cells appear across the four watches. The W-218H-3BV uses a CR2016, the two W-221H models use a CR2032, and the MWD-110H-3AV uses a CR2025.
Casio’s page for the W-218H-3BV states a battery life of approx. 7 years. The pages for the W-221H pair and the MWD-110H-3AV state approx. 10 years, and the brand gives these as expected figures for each cell.
Because the cells differ, a man who plans a later battery change will need the cell type of the particular model first. The four India product pages give no replacement procedure and no service interval.
Water resistance ratings and what the markings cover
Casio states 50 m for the W-218H-3BV, which it also expresses as 5 bar, and the same depth for both W-221H models. The MWD-110H-3AV carries the brand’s 100 m figure, the highest among the four, and its page names no test standard for it.
The India listing page for watches offers water resistance filters at several levels, up to ISO 200 m. That page does not attach the filters to a named product, so they say nothing about the four watches here.
A Spanish language page on water resistance from the same brand, translated for this guide, says the ratings follow DIN 8310 and ISO 22810. The ISO page for ISO 22810 says the standard sets out what a water resistant watch must meet, the test methods used to check it, and the markings a maker may put on it. That ISO page does not list test pressures or explain what a rating means for swimming.
On the Casio page, a watch without the Water Resist label should not be exposed to water in any form. The Water Resistant marking covers splashes and rain only.
The 5 BAR marking, also shown as 50 M, covers bathing, showering and hand washing, and the page says the watch is tested to 5 bar. The 10 BAR marking covers regular swimming and snorkelling, while the 20 BAR marking covers freediving without equipment.
According to the page, the metre figure on a marking is a pictorial representation of the test pressure, the page says, and does not refer to the depth of immersion. A reader comparing 50 m with 100 m is therefore comparing two test classes and not two diving depths.
Read across to the product pages, the W-218H-3BV and both W-221H models carry a figure that the Spanish page pairs with the 5 BAR description, and the MWD-110H-3AV carries the figure it pairs with the 10 BAR description. The India pages themselves do not repeat the activity wording, which comes only from the Spanish page.
Casio adds that seals age and wear, and that extreme temperatures, solvents and cosmetics speed this up, so water resistance may no longer be guaranteed. The page gives a usable temperature range of roughly 10 to 50 degrees Celsius, and says vigorous swimming or striking the water can make the watch unstable.
Case size and the four watches in brief
Measurements differ across the group. The W-218H-3BV measures 44.4 x 43.2 x 10.8 mm, which is the thinnest case of the four.
Both W-221H models are listed at 43.7 x 38.4 x 12.2 mm, and the W-221H-8AV is described with a resin case. The MWD-110H-3AV is the largest, at 50.8 x 47.2 x 12.3 mm.
The W-218H-3BV suits a buyer who wants a sporty digital with an alarm, a stopwatch and a stated water resistance figure for everyday wear. It runs on a CR2016 cell, and its page describes the display only as a bold display and gives no warranty term.
For a larger LCD, a countdown timer and world time, the W-221H-8AV is the model the brand lists, together with the longer stated battery life. It takes a CR2032 cell, and the page gives no warranty term and no display type field.
Another colourway of the same feature set is the W-221H-1BV, compared with the 8AV listing. Its large LCD is described by that phrase alone, since the page has no display type field and no warranty term.
Anyone who wants the largest case in this set, and a deeper water figure for a watch worn around water, is the buyer the MWD-110H-3AV suits. Its cell is a CR2025, and its page states neither a display type nor a warranty term.
Battery replacement and care guidance from Casio
Casio’s Malaysia FAQ on battery replacement asks owners to take the watch to the original retailer or an authorised Casio service centre for the battery change. The FAQ also advises asking for a water resistance check at each replacement, and recommends a seal check as part of the change.
It warns that resin decorative parts can wear, crack or bend with normal use. A watch that shows possible damage on submission is returned without the battery service.
A second Malaysia page, on handling and care, says a watch with no WATER RESIST marking is not protected against sweat. It adds that the watch should not be used for scuba diving or any diving that needs air tanks.
After exposure to sea water or mud, the same page advises rinsing the watch with clean fresh water. It advises against wearing the watch in a bath, a heated pool or a sauna, and warns that sudden temperature changes can fog the glass.
Resin bands can be washed with water and wiped dry with a soft cloth, the care page says. It also says resin parts can discolour from sweat, dirt, sunlight and long term wet storage.
Both Malaysia pages are general Casio guidance and were not written for the W-218H, W-221H or MWD-110H models.
Warranty and details the pages leave out
Casio’s warranty page for the US market gives a warranty period of twelve months from the date of purchase, valid only for service in the country of purchase. The same page leaves out the battery, band, glass and case when they are worn or damaged, and asks for a copy of the sales receipt before any claim.
Read beside the Malaysia battery FAQ, the two general pages place a battery change with the retailer or a service centre and leave the battery itself out of warranty cover when it is worn or damaged. Neither page was written for these models.
That warranty page applies to the US market. None of the four India product pages states a warranty term, so the length of cover for these models in India is not known from the pages used here.
The display type is also missing on every product page, apart from the descriptive phrases already mentioned.
All four watches come from one brand, which keeps the comparison consistent but means no second maker is represented. The water resistance figures and the battery years remain Casio’s own statements, and the product pages are the only source behind each one.
