Konohan 8 Pieces 12-Digit Calculator, Solar Basic Desktop Calculator Large Display Electronic Dual Power Handheld for Home Office School(Black)

These calculators work really well. I've had them for years now and I can't even remember changing the battery on them. I think I did it once on one of them. They're not rechargeable batteries in them. I use a couple of them all the time. I've only used about four or five of them and I'm so glad I got extra in case somebody walks off with one. Cuz I don't think they're going to break. I've got other calculators in my closet that need a battery but it's always finding that special little round battery at the store that's the problem. These take an A A battery and the little cover Clips on and off real easy, doesn't break. And doesn't get lost. I would highly recommend buying these. I've only had one calculator that's lasted very long. I bought it in 2002 and and it's still going strong I've never replaced the battery. It's one of those sunlight rechargeable ones. But it doesn't go that high it's only an eight figure. I play a lot of games online and everything they do now is in the millions and billions. Oh my I'm impressed. Bunch of nonsense. But these calculators help out immensely and figuring out all those High numbers. I can only round them off in my brain. And they're good for doing taxes and other things. Yeah my taxes aren't in the Millions. I don't do any scientific equations on them so I don't know if they'll do that or not. But otherwise they've worked very good. And if you got a bunch of people around you that will take your calculator and put it in their bedroom or their backpack and take it to school or something then this is a good amount to get and it has a very good price on it. They usually try to charge you 12 to $15 on just one of them. So buying these will save you some money.. numbers are big and all the pads are big enough that you won't hit the wrong one and they don't get stuck the numbers on the display are very big so you won't have a problem reading them. Unless your eyesight is kind of messed up. Don't want you suing me for saying something.

tested them on arrival,seem to work well, no stuck buttons as someone commented

Simple and effective calculator. Use this for my food truck.

Good feel, decent buttons, easy to read. Inexpensive because they do not include the batteries for the back up power source,

Large display, easy to read and use

The buttons stick or don't push in all the way. I don't use them very much because the buttons cause mistakes.The panel is not backlit.I do like the optional battery.I do use these calculators when my phone is not available.Good value but the buttons suck.

Sturdy, durable, functional. My only gripe is that they don't have the (-) key.

Unfortunately, not durable enough for daily classroom use. Have had to throw many away.