steel case with a screwed-down back whereas the GW-M5610 has a resin case with a stainless steel back plate held down with four screws. Both watches have identical features including solar charging, atomic time synchronization, World Time, four daily alarms with snooze function, a countdown timer, a stopwatch, and electroluminescent illumination that can be automatically engaged with the movement of your wrist in a dark environment. The GW-M5610 gets a red surround and white, blue, and yellow writing on the face which makes it a little busier aesthetically than more monochromatic versions of the 5000 and 5600 series.

The first thing I noticed about the watch is how much smaller, thinner, and lighter it is compared to round G-Shock versions I own. It is an excellent choice to wear under long sleeves and jackets because it easily fits underneath them with minimal interference. I will be using this watch in the winter months for daily wear due to its sleek profile. The second thing of note is the crisp clarity of the numbers in the positive LCD screen. It surpasses my Casio Pro-Trek PRW-3500 in regards to off-axis legibility even though the Pro-Trek’s digits are 50% larger than the GW-M5610’s. I am really impressed with how good this watch’s display is.

I find the strap fits comfortably on my 7-1/2 inch wrist. The light weight makes me forget that I am even wearing a watch at all. Contrary to the dozens of complaints from previous owners here on Amazon, my auto backlight function works perfectly fine even though I leave it shut off in order to conserve power. My watch was manufactured on January 8, 2015 so maybe Casio has finally fixed the issue with faulty backlight switches. There are several one star reviews of this watch here because of this issue and I honestly cannot understand how one can downgrade the rating of the entire watch due to one feature that most G-Shock users end up turning off anyway. The auto backlight duration unfortunately is not adjustable like my Pro-Trek and Gulfmaster. I would prefer the ability to lengthen it from 1 second to 3, but this is a minor nit.

The function buttons are all recessed into a protective niche on the side of the case so pressing them only works for me when I use the tip of a fingernail. Action is positive and appropriate for the pressing force I apply. The World Time, stop watch, and timer functions all work like other Casio digital watches and are intuitively accessed with mode button. The one complaint I do have is that the volume of the alarm signal is very weak and probably would not wake a person from a deep sleep. If Amazon’s star rating system would allow it, I would subtract a half star for this and would suggest not relying on this watch for important wake-ups and instead using the alarm from dedicated alarm clock or smart phone. Note that this isn’t any different than the other Casio solar-charged watches, so it may be a function of reduced battery capacity.

My watch arrived from Amazon with the power reserve showing at the Medium level. I put it out in the sun for about 30 minutes and the reading went to High. I set my home city, clicked Daylight Savings Time to the automatic setting, and synched the watch to the atomic clock signal in Ft. Collins without any trouble. Each evening just after midnight it synchs automatically so the watch always has an accurate time reading. I’ve had no issues with not receiving the signal but then again I live in a state bordering Colorado and all my atomic watches synch each day without fail.

This watch is a great heir to the spirit of the original G-Shock. It wears small and comfortably on the wrist, is tough as nails, cost about one-third of what the GW-5000 does, has the accuracy of atomic synching, should run for a decade or more on the original solar battery (note that all solar watches will need to have the rechargeable battery replaced as some time in their lives), and has a very clear and legible display.

As a long-time G-Shock owner, I have previously been drawn to only the round case models. I find it remarkable that after finally taking the plunge with this square case GW-M5610 that I have been absolutely delighted by this watch. It’s certainly not very flashy and has a nerdy charm of its own. No one in going to compliment you on it, but that’s all part of the fun of being a G-Shock fan. I now regret taking so long to come around to the Square Side and can recommend this watch most highly.

从日本进口的GW-5000是由1983年发售的卡西欧G-Shock演变而来。这款GW-M5610是该款手表的第一代产品，秉承了很好的G-Shocks传统精神。GW-5000已经没有了不锈钢表壳，背面有一个螺丝扣，而GW-M5610有一个树脂外壳，不锈钢背板用四个螺丝固定。这两款手表具有相同的功能，包括太阳能充电，原子时间同步，带有世界时间，四个有贪睡功能的日常闹铃，倒数计时器，秒表和电致发光照明等，可以在黑暗的环境中自动识别您的手腕动作。 GW-M5610表盘上有一个环绕的红色材料和白色材料，还刻有蓝色和黄色的字，这使得它在美观程度上显得比5000和5600系列的单色版更华丽一些。

我注意到手表的第一点是比我所拥有的G-Shock版本更小，更薄，更轻。这是一个很好的可以戴在长袖和夹克下的手表，因为它最适合戴在下面，干扰也最小。因为它有着时尚的外形，所以我会在冬季的时候一直戴着这款手表。注意到的第二件事是正面LCD的屏幕数字很清晰。Pro-Trek的数字显示比GW-M5610要大50％，它的离轴可读性也超过了我的卡西欧Pro-Trek PRW-3500。我对这款手表的展示效果印象深刻。

我发现这个表带很适合我的大约7-1 / 2英寸的手腕。重量太轻甚至经常使我忘记我一直都戴着手表的。与之前在亚马逊的几位顾客的抱怨相反，我的手表背光性能得很好，即使我为了节约电力而关闭它也是一样。我的手表是在2015年1月8日制造的，所以也许卡西欧终于解决了错误的背光开关这个问题。这里有一星评论都是由于这个问题，我是真的不明白怎么会因此而降低对手表的评价，因为大多数G-Shock用户最终都会选择关掉这个功能。不幸的是，自动背光的持续时间不像我的Pro-Trek和Gulfmaster那样是可调的。我宁愿把它从1秒延长到3秒，但这是一个小小的缺陷。

功能按钮都隐藏在手表侧面的防护壁龛中，因此，只有在使用指甲尖的情况下才能使用它。只要我稍微按它一下就可以了。世界时间，秒表和定时器功能都像其他卡西欧数字手表一样的工作，并可以通过模式按钮直接使用。我有一个不满意的地方是，报警信号的音量非常弱，一个人深度睡眠的时候可能唤醒不了。如果亚马逊的星级评分系统允许的话，我会为此减去一半的星级评价，并建议大家不要依想着用这只手表来叫醒你，而是使用专门的闹钟或智能手机的闹钟。请注意，这与其他卡西欧太阳能充电手表没有什么不同，所以它可能是电池容量减少的原因。

我的手表是在亚马逊买的，电量储备显示差不多在一半的样子。我把它在太阳下放了大约30分钟，看到电量充到了高电量。我设置了我的家乡，点击夏令时进入自动设置，并将手表同步到Ft中的原子钟信号，中间没有出现任何麻烦。每天晚上午夜之后，它会自动进行同步，所以手表的时间总是有准确的。我都没有动过，但是遇到了收不到信号的问题，但是当我再次住进科罗拉多州的一个州时，每一天我的原子钟都会同步运行。

这款手表是G-Shock原创精神的继承人。它在手腕上小巧舒适，材料坚固得像指甲一样，成本约为GW-5000的三分之一，具有原子同步的准确性，原始太阳能电池应该可以运行十年或者更长时间（请注意，所有太阳能手表将需要在它的一生中的某个时间重新更换可再充电电池），并且手表显示具有很高的清晰度。

作为一个长期买G-Shock的人，我以前只被看到过圆形案例模型。我发现这款手表的时候我非常高兴，终于开始大胆尝试这款方形表壳GW-M5610。这当然不是很华丽，但有其独特的魅力。没有人会恭维羡慕你，但是这是G-Shock粉丝的乐趣的一部分。我现在很遗憾花了这么长的时间来到这里，但是真心推荐这个手表给你。

behind its previous descendants. This model is based on the DW-5600C-1V, the same watch worn by Keanu Reeves in the movie 'Speed', but more impressively, the watch was approved for NASA space missions.

Although this G Shock isn't the DW-5600C-1V, it is a modern upgrade replete with the same qualities which made it so robust.

The watch itself was delivered quickly by Amazon to Australia. Setting up the time was a simple process, and because I have small wrists, I find the bigger G Shocks tend to be a bit big on the wrists and get in the way a bit, this watch however is a good size.

The most impressive thing is the atomic time keeping function of this watch. Currently living in Australia, I am unfortunately unable to take advantage of this feature, however, being someone who travels a lot, I will be taking advantage of this option.

I also constantly use the auto-illumination option, as I am a nurse who frequently works night shifts, this feature is great for keeping time in a dimly lit ward. A simple tilt of my wrist at a 30 degree angle illuminates the time.

Most importantly though, the reason I bought this watch is due to its robustness. This watch will hold up just as well as some of the more expensive G Shocks out there. Being solar powered, I will only have to change the batteries every 10 years or so, not potentially every 2.

A great buy, a great watch made by a reliable company.

这款手表吸引我的是它的设计，为了纯粹的实用成为了实用的理由，还有它背后的改良历史。这款腕表基于DW-5600C-1V改造而来，与Keanu Reeves在电影“Speed”中佩戴的腕表相同，但更令人印象深刻的是，该腕表被批准用于NASA太空任务。

尽管这款G Shock并不是DW-5600C-1V，但它是一款具有同样品质的现代升级版，功能非常强。

手表本身由亚马逊迅速交付给澳大利亚。设定时间是一个简单的过程，而且由于我的手腕很小，我发现较大的G Shocks在手腕上往往有点大，并且有一点阻碍到手的活动，但这款手表的尺寸很合适。

最令人印象深刻的是这款手表的原子计时功能。目前居住在澳大利亚，不幸的是我无法利用这个功能，然而，作为一个经常旅行的人，我会利用这个选项。

我还经常使用自动照明选项，因为我是经常夜班工作的护士，这个功能对于需要在光线昏暗的病房中看时间的人来说非常有用。我的手腕只需要30度角简单倾斜就可以看到时间。

但最重要的是，我买这款手表的原因是因为它的坚固性。这款手表的价格不亚于一些更昂贵的G Shocks。太阳能供电，我只需要每10年更换一次电池，而不是每2年更换一次。

一次很好的购买，一个可靠的公司制造的很棒的手表。

mic synching is why I bought the watch, and for me, these two features make this watch more than worth the price of admission.

The solar feature works as advertised. The power indicator was at "M" / Medium when the watch was delivered, but bumped up to "H" / High within a couple days, and has stayed there ever since. Granted, the battery won't last forevermaybe 10 to 15 yearsbut I'll worry about that around 2030.

The atomic sync took a little trial-and-error; being on the east coast, I'm a long way away from the transmitter in Fort Collins. After a few days, I discovered that as long as the 12:00 position on the dial was pointed westwardthe direction of the transmitter from my current locationthe watch will "catch the wave" every night. On a trip out west, closer to the transmitter, the watch was much less particular about orientationit even synced from a moving train during an overnight ride. I couldn't get it to sync from a cabin on a cruise ship, thoughmust be the thick metal hull.

I always want my watch to be as accurate as possible, and the syncing accomplishes this. It's perfectly synced with my computer, my phone, the clocks in train stations and airports. On the cruise when it couldn't sync, it didn't drift more than a second off the actual time, so it looks like the accuracy is pretty good even without the sync.

I've swam with the watch, snorkeled with it, showered with it, dropped it. It doesn't care. It's a G-Shock.

The screen is easy to read. The backlight is nice and bright, though it only lasts for a second or two before it shuts offshorter than some backlights on non-solar watches. The Auto El works for me, but isn't perfectoccasionally it doesn't go on when you flick your wrist, and occasionally it does go on when you don't need it toso I generally leave it shut off, unless there's a reason why I need it to light up without physically pressing the button.

As for other features, the World Time is useful for travelwhether it's you in another time zone, or someone you care about. The alarm is not super loud, and it only lasts for 10 secondsbut its loud enough to wake me up, and the snooze feature can make it sound again, just in case you don't hear it the first time it goes off. I use it when travelling. Stopwatch is nice to have; I don't use it that much. The countdown timer I use a lot.

The watch is comfortable to wear. It's not overly bulky like some of the G-Shocks can be. I personally wouldn't want a bigger watch than this one. I like how it looksit has a classic design. Not that I would wear it with a suit, but I don't have to wear one most of the time.

In short, this watch does everything I need it to do. Thanks to the syncing feature, it keeps perfect time, and thanks to the solar feature and rugged construction, I can expect it to keep doing so.

A lot of folks use smartwatches these days. Maybe I will upgrade to one someday myself. For now, though, many smartwatches lack an always-on display, or lack the rugged construction / water-resistance, or have to be charged daily, or require an Internet connection to maintain the correct time. Personally, I'll hold off on a smartwatch until they're a little more like my G-Shock.

太阳能功能和原子时间的同步是我买手表的原因，对我而言，这两项功能使这款手表更值得欣赏。

太阳能功能就像广告所示的一样。当手表交付时，功率指示器处于“M”/中等，但在几天内就达到了“H”/ High，并且从那以后一直保持在那里。当然，电池不会永远持续10到15年，但我会担心是否能到2030年左右。

原子同步需要试验一下，可能或遇到一些错误;在东海岸，我距离科林斯堡的发射机还有很长一段距离。几天之后，我发现，只要表盘上的12:00位置指向西，即从当前位置向着发射机的方向，手表每天晚上都会“捕捉波浪”。在西部的一次旅行中，靠近发射机，在夜间行驶过程中，手表甚至不再与行驶中的火车同步。我无法让它在游轮上的舱内同步，但是在厚厚的金属船体。

我总是希望我的手表尽可能准确，并且同步完成此操作。它完全与我的电脑，手机，火车站和机场的时钟同步。在无法同步的巡航中，它在实际时间内偏差的时间不会超过一秒，所以即使没有同步，它的精度看起来也相当不错。

我戴着手表游泳，戴着它潜水，水淋上它，扔掉它在地上。都没有出现任何问题。它是G-Shock。 

屏幕很容易看时间。背光源的亮度非常好，但它只能持续一两秒就会关闭，而不是非太阳能手表上的一些背光。 Auto El适用于我，但并不完美，当你轻弹手腕时它不会继续，偶尔它会在不需要时继续使用，我通常会将其关闭，除非有原因我需要它在没有按下按钮的情况下点亮。

至于其他功能，世界时间对于在其他时区旅行的人很适用，或对您关心的人很有用。闹钟不是超大声的，它只能持续10秒，但它的声音足以唤醒我，而贪睡功能可以使它再次响起，以防第一次响起时听不到它。我旅行时会使用它。很高兴有秒表;虽然我没有怎么用。倒计时器我用了很多。

手表佩戴起来很舒适。它不像G-Shocks那样过于庞大。我个人不想要比这更大的手表。我喜欢它外观的经典设计。并不是说我会穿西装，但我大部分时间都不用穿。

总之，这款手表可以满足我需要的一切。由于同步功能，它可以保持完美的时间，并且由于太阳能功能和坚固的结构，我可以期待它继续这样下去。

现在很多人使用智能手表。也许我自己某一天也会升级。然而，现在，许多智能手表缺乏永远在线的显示屏，或缺乏坚固耐用的结构和防水功能，或者必须每天充电，或需要连接互联网以同步正确的时间。就我个人而言，我会延缓更换智能手表，直到他们更像我的G-Shock。