12-Digit Battery Dual Powered Handheld Electronic Business Mini Solar Basic Desktop Financial Scientific Office Calculator, Simple Desk Calculators with Large LCD Display

This is exactly what I was looking for--a big, easy to read calculator with nice keyboard keys. It's made well, I love the way it's laid out, and the keys function wonderfully. Don't be deterred by the fact that there's not a brand name anywhere on it--it is definitely worth the price.

I can do 10 key by touch on a full sized calculator, and I can do 10 key by touch on this smaller one too. You don't have to really press down on the keys like some other hand held calculators.

Firstly, for around $10, having it delivered to my door "next day" and being able to use it in its basic form right out of the box... I will say it appears to be a fair value. It's not "great" in any way, if compared to high quality desk calculators. But for a "private label" knock-off, it appears to do what I need here in my home office.Having used calculators since their introduction in the early 70s, I do remember the first generation of cordless calculators, circa 1972. This is not that quality...... it's today's level of expected "utility" quality; it's lightweight, and has mushy button-push with side-travel. Quality calculators have button push travel that's "straight down" where the button feels well supported, somewhat like your computer keyboard. Regarding the power sources, I've read reviews about the "solar cell" being a non-operative item, so I'm relying on the AA battery I put into the unit upon receipt, and the auto-shut-off that kicks in around 5 minutes.SEE MY ATTACHED PHOTO of the calculator's instruction sheet..... For the average "I just need a basic calculator", this should fit the bill. But if you're looking to utilize the few extra functions available, don't look for instructions that will fully explain the why's and how's. The operating instructions are typical-poorly written and barely adequate. So, If you don't understand, or even if you do understand, FLOATING DECIMALS and ROUND-UP/DOWN functions... you'll need another source to better understand those two slide-switch functions on this device. I'll attach a photo of the instructions...... and you'll know what I mean. But at least you do get those two functions.SEE ATTACHED PHOTO OF calculator with my two rubber washers attached to backside of case..... One very physical-usage issue that does cause me a problem is the extremely light weight of this calculator. There are two rubber feet on the front edge, but the back edge that sits on my desk are just two thin and hard 1/4 inch plastic lines that eminate from the case. I added my own rubber feet on the backside to keep the calculator from sliding. I grabbed two flat rubber washers, and attached to the case with foam-tape. It's now more stable.

I'm a cyber math teacher and wanted a calculator with big buttons so that I can use it as a demonstration tool for my students. Because this is more of a financial calculator be careful because it doesn't know the order of operations. It will not give you the correct answer if you type 2*3+3*2. The correct answer based on the order of operations should be 12. Instead if you enter the numbers and operations from left to right, the calculator will give you the answer 18.

I already had a couple of calculators, but they were a bit flimsy and hard to read the numbers sometimes. This one feels much more like the larger desk calculators, and was working on solar right out of the box! Haven't put a battery in it and have been using it for the last couple days without a hitch. I like the feel of the keys, and while I typically don't need all the functions, it does provide all of the same functions that my desk calculator at the office has. Overall I really like this, and feel the price is very good for what you get!

Very helpful calculating basic math related to my company's finances etc as well as computing the more significant calculations required by the built-in-time machine, if you want to end up in the right epoch of history, that is. You will definitely want to use the advanced functions to ensure you do not end up eaten by a dinosaur or suddenly appear in the middle of a 19th century smallpox epidemic. Even if you're not up for time travel in the literal sense (and to be fair, DS200MKL held its own in that capacity!) gazing upon its retro contours will likely inspire nostalgia for a time when a desktop calculator could inspire excitement, intellectual curiosity, and -- dare I say it? -- the dream of a more sensible human society defined as much by its love of reason as its compassion for fellow humans and animals alike. Except sloths. They're useless.

This is a decent calculator. It’s slightly overpriced for what you get IMO. It’s VERY cheaply made. The buttons are light and flimsy. This is something I would have expect to see at a dollar value store for about 99 cents. Was somewhat disappointed realizing this when I got it. The digits are not very dark/readable and has a longer than usual delay. At the end of the day, it’s a basic calculator so I won’t return it. I just wish it was better quality for the money(10dollars).

Arrived with a dead battery. Calculator built in Solar Array does not have enough to power it even when sitting in the sunlight in front of a window. I had to buy another battery LR41 which was $6 for a 5 pack. Turned out to be almost a $20 calculator which I didnt want to spend.