Overall, the new GMB2100 dial is another level above the GM2100, however, the solar-powered recharging system necessitates a translucent material and thus prevents the application of a brushed or sunburst finish on the dial, whereas the GM2100 does feature a nice vertical brushed treatment. Also, the higher-end GMB2100 comes with a monotone color scheme, which looks menacing but is perhaps not as legible as the silver dial seen on the GM2100. Signal Range: Up to 2m (may differ depending on surrounding conditions), Auto time adjustment, Easy watch setting, Approximately 300 world time cities, Time & place and Phone finder using the CASIO CONNECTED APP

Even with a mobile Bluetooth connection, the movement is accurate to -/+ 15 seconds per month. The approximate battery operating time is 7 months when fully charged, with normal use, even without light exposure, and 18 months when stored in total darkness and the power save mode activated. With the GM2100 series, you get the hype of the CasiOak — which is named for its resemblance to watch designer Gerald Genta’s famous octagonal Royal Oak design — now in a more durable and premium metal-clad version, and for a very reasonable price. A luminous coating provides long-term illumination in the dark after only a short exposure to light.One simple yet useful upgrade Casio made to the GMB2100, is the addition of lume for the hour markers, not just luminous hour and minute hands, as was the case with the GM2100. Both have on-demand dual LEDs for visibility in total darkness, still, the fully-lumed dial is a nice touch. With a push of a button, hands are moving and permit a free visibility of functions like stopwatch or date. The GMB2100 wears great on the wrist thanks to the relatively conservative 44.4 mm diameter and 49.8 mm lug-to-lug by 12.8 mm case size. Being that this has an aesthetic resemblance to the Royal Oak, going much larger would put it into a whole other territory. And on that note, I think that if this watch reaches critical mass for Casio, it would make sense to offer it in a smaller size as well, just as they have with previous resin, translucent resin, and metal-covered models. Of the DW-5000C-derived Casio designs, this is one of the best, and while I’d like to see a little more contrast on the dial of the Full Metal GMB2100 or an option for a strap, both the Metal-Covered GM2100 and the Full Metal GMB2100, represent great looking watches, with good Japanese quartz precision, and incredible durability. Pressing a button on the watch records the date, time, and position on a map, which is then viewable within the Casio Watches App. The watch can remind you of up to five upcoming events, which you set within the app. There’s a phone finder function activated from the watch.

On the wrist, I expected the 44 mm diameter to be cumbersome and a bit too large for my wrist and personal taste, but in reality, the case feels more like a 40 or 42 mm, primarily because the hinges on the left and right sides of the case add to the diameter but don’t make the watch wear as large as the dimensions suggest. I’ve yet to try on the smaller GMS2100 Series, which measures 40 mm in diameter, but I imagine it will have similar real-life wearability, which is to say it will likely wear small and comfortably as well — which is a good thing. At 11.8 mm, the case is incredibly thin and greatly enhances the incredible ergonomics. The lug-to-lug at 48.5 mm is also a key factor in why this watch wears so well (Casio’s official specifications state that it’s 49.3 lug-to-lug). A mixture of vapor deposition and grind mark finishing on the outer ring and indices, respectively, adds a luxurious texture to the dial. On The WristDual Illuminator: Separate illumination of the analogue and digital components ensures optimum readability in low light conditions., LED light, Selectable illumination duration (1.5 seconds or 3 seconds), With afterglow The combination of stainless steel and glass fiber reinforced resin supports the stability of the watch and provides a better wearing comfort. The hour and minute hands move like normal quartz-powered analog hands, with the exception that the minute hands move every 20 seconds, to conserve energy. The dedicated analog display on the right shows the battery level and mode. The small digital display can show hours, minutes, seconds, AM/PM, month, date, and day. Hand shift feature which allows you to move the analog hands out of the way to provide an unobstructed view of the digital display. The button tones for using the mode button can be turned off. This means that the watch no longer beeps when switching from one function to another. Preset alarm or countdown timers remain active when the button tones are deactivated.

Powered by any light source, saving time and money as no battery change required- known as TOUGH SOLAR

Model Comparison

Technical amendments and errors excepted. The sizes in figures do not correspond to the original sizes.

Elapsed time, split time and final time are measured with 1/100-sec accuracy. The watch can measure times of up to 24 hours. Measuring Capacity: 24 hours, Measuring Modes: Elapsed time, split time, Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) While the module is not Bluetooth connected or solar-powered, there’s a certain level of reliability that can be appreciated by a watch you set yourself and that’s powered by replaceable batteries. Not to mention, this allows Casio to offer a solid dial — versus a semi-transparent dial that’s required for sunlight to enter on a solar-powered watch — with the attractive vertical brushed vapor finish. There are almost always trade-offs, and this is a good one considering the dial, to me, is one of the primary highlights of this watch. CASIO WATCH+ World Time lets you select from among approximately 300 cities as the World Time City, Displays the current time in major cities and specific areas around the world

Comparing Products

With the Casio Watches App, you can set the world time with 38 time zones (38 cities + coordinated universal time), city name display, daylight saving on/off, auto summer time (DST) switching, and Home city/World time city swapping (approximately 300 cities in total). The built-in stopwatch is accurate to 1/100th of a second for the first 60 minutes, after which the accuracy changes to one second, and the total measuring capacity of 24 hours. You can measure elapsed time and lap/split time and there’s also a 60-minute countdown timer. There are 5 daily alarms available to set and an on/off hourly time signal, as well as a battery level indicator so you can ensure that the battery has received enough sunlight/artificial light. To conserve energy, the Power Saving features blanks out the display automatically when not in use (left in the dark). 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 The time can be set to the nearest second and up to 24 hours in advance.