To avoid confusion, I use aftermarket silicone bands from Ritche, purely for the aesthetic and not because there was a problem with the ones included on the watch.I've worn these style of Casio calculator watches for most of my life, and despite some shortcomings that I will detail below, I really do love them.The first thing to wear out is usually the bands, especially if you bring your watch into the shower. My bands typically last about a year, give or take a few months. I do bring mine into the shower, loosening the bands to clean my wrists, and I believe the hot water and soaps cause the plastic bands to become hard and brittle over time. I'm going to continue doing it, because I suck at time management and an easily replaceable timepiece is invaluable to me. Some people replace the whole watch after the bands break, since they're so affordable. My grandfather would stick the old watch bodies in places with glue, Velcro, or adhesive pads. Handy to have a tiny calculator clock in all of your working spaces.If you replace your bands, here's some information. These use standard 20mm pins and straps, though there is a bit of a protective lip overhanging each of the pins. Those lips may block thicker bands from fitting, so maybe reconsider if you plan to use a thick leather or metal band for some reason. The Ritche bands that I use have quick release pins for easy installation and removal, but it was actually quite a squeeze to get them in despite that. I imagine over time the protective lips will dig a permanent impression into the silicone, if the silicone doesn't just rot from the abuse I put it through.These are water resistant, and I don't recall ever having an issue with water damage from taking it in the shower. My last one did stop responding to button presses unless I took the back plate off, which somehow was causing the C button (mode switch button) to stay permanently depressed. Never figured out the cause, but perhaps water damage, or perhaps the return spring was just gunked up with something that was dragging against the backplate.They are not waterproof, "resistant" is the key phrase. My grandfather had one glued to his outdoor grill, and that one filled with condensation after a few years. I may be misremembering, but I thought these used to have a label marking them as water resistant up to a depth of 12 feet, but now they just say "water resistant". My interpretation of that is you're not meant to swim with it, but can still take it in the shower with no real risk of damage. I did swim with my first one that I believe had that label, and I don't remember any issue arising from it.On to the features, of which there are a lot for such an affordable watch.Right up front, these do not have any form of backlight. If you need to read it in the dark, then bring a light. While this dramatically extends battery life, I still consider it the most dramatic shortcoming of the family of Casio calculator watches that includes the Model 437, 438, and 3208.The clock can be set to a 12 or 24 hour display, and also features a basic calendar. The day of the week is always displayed above the seconds counter, and the full date in Year-Month-Day configuration can be displayed by holding the ÷ button. Notably, the year counter is 2-digits; at the time of writing, the year is "20" for 2020, and next year it will display "21". Not only am I bad at time management, I can never remember the current date, so this is also invaluable to me. There's no fancy features with the calendar, no appointment reminders or anything to assign to a specific date, but still a much appreciated addition.I also use the calculator frequently in daily life. It's got most of the features you would expect from a very basic calculator, but definitely isn't a replacement for something more advanced like a scientific or graphing calculator. Notably, there are no memory buttons to save a number for later, so you must use your own memory or make a note of any important numbers. Constant calculations are done by double pressing your function command, i.e. 8÷÷4. You will know you've set your number to a constant because a "K" will appear above your number around the top left of the display. To square a number, you double press X and look for the same "K", then press =, i.e 3×× =9, then you can hit = again to go up another power, from 3² to 3³ and so on. Not necessarily the most intuitive, but I figured it out as a kid without reading the instructionsThe calculator face is 8 digits, or 7 when dealing with negatives. Decimals are supported.The alarm works fine, not much to say about it, loud enough to hear but not too loud. As soon as you get the watch, you can test the alarm sound by holding 0 and + while on the alarm screen. I started silencing my alarm in my sleep, so I only use it for reminders and not for waking up. You can enable and disable your alarm by pressing the 4 button when you're on the main clock screen or on the alarm screen. You only get one alarm, so you can't have a bunch all set up to go off at different times at different days. You can enable in the Clock screen or in the alarm screen a single beep to go off once every hour on the hour by hitting the × button. The single hourly beeps that Signal mode provides are not particularly disruptive, but can be helpful for keeping track of time, and that's the closest you get to having individual programmable alarms for reminders.The Dual Time mode is a nifty feature, allowing you to keep track of a separate time somewhere else on the globe. The minutes must be configured manually, as not all timezones are running on the same minute, but the seconds counter is automatically copied from the time you've assigned to the main clock, and can only be changed from the main clock. The DT clock uses the same time format as your main one, so you can't set one to 12h and one to 24h.The stop watch may have more features than you'd expect. I personally don't use it often, but the manual for the model 3208 is on Casio's website and will tell you everything you need to know. Notably though , the stop watch is limited to 23h, 59m, 59.99s. A second note, a single beep occurs every 10 minutes that the stop watch is running.One often overlooked feature that I feel I must bring up is the battery saver, which disables the beep which normally happens with ever key press. I enabled it because I don't like making a lot of noise; not to say the beep is loud, but it is a noise. You enable battery saver by going to your calculator screen and hitting the "B" button, which is the recessed button underneath the mode switching "C" button. This doesn't disable other sounds, like the alarm, hourly signal, or any sounds from the stop watch.That's my review of the features, now a few additional notes.Aside from the color options, there seems to be one major difference with these models over the more classic pure black model, and that difference is the display. I can see why many of the reviews complain that the display on this specific model is hard to read, though I don't have much trouble with it after getting used to it. Unlike older models, this display is inverted; the background is black and the characters are the kind of greenish-grey that would normally be in the background. Aesthetically, this change is interesting, but I find it slightly harder to reach under harsh glare, and observe no difference in legibility in average or low light environments. As stated in the beginning, there is no backlight, so none of these style calculator watches are good for low light. I am curious how this inverted color display effects battery life, as I was under the impression that in these kinds of displays the black portion required power and the grey-green section was unpowered. Perhaps I've got that backwards, or perhaps power is only required in the operation of shifting between light and dark.Casio does have other models of calculator watches that have backlights, but they're more expensive and may not be as ruggedly designed to survive abuse; I've never owned one, so no comment.I've known people to struggle with the buttons on the face of the watch, as they are very small and give no real tactile feedback. Just little rubber membrane nubs pushing through a plastic grate basically, with no room in the watch to fit some kind of clicky mechanism. I've gotten used to the tiny rubber "Chiclet" keys, even with the button-press sound disabled. I find it works best for me to think of it as pressing the buttons with the bone of your fingertip, and not think about all the flesh around it. The keys are stiff enough that your skin will usually just squish around the buttons you're not trying to press, and only the one in the middle where your finger bone is gets pressed. I will say, that strategy may not work if you have heavy calluses on your fingers, in which case you can use your fingernails. Haven't found fingernails to do much damage to the rubber keys, just the occasional scrape but no deep cuts; think the rubber is flexible enough to fold inside the watch face before you put enough pressure on to actually cut it with your fingernails.The "B" button is recessed, as I mentioned before. I don't find it too hard to press with even a well trimmed thumbnail, but some seem to struggle with that one too.The display is under a somewhat thick layer of plastic, not glass. It's a little bit hard, but can definitely still scratch. I wear my watch on the inside of my wrist, and because of that I think I haven't bumped the watch face into things that often, so no deep scratches and just a few light ones that really only get picked up by camera flash.I've been wearing my new one for only about a month and a half, but it's similar enough to the ones I'm used to that I feel confident in giving such a detailed review.If you're the kind of person who made it all the way to the end of my ridiculously long review for a budget-oriented watch, then you may be the kind of person who would enjoy wearing this watch. If the color is unimportant though, I may recommend the more standard black model without the inverted color display, just because this one is at the very least slightly more difficult to read sometimes.