Back in the 70's I was working with electric calculators to balance books. Later in life, I used a tiny solar powered calculator, that started to fail. This is an upgrade, with easy to read numerals, and big buttons. It's got more keys that I'm used to, and it's taking a while to get used to. I do like it. I'm using an AA battery for backup, as I use it at my computer in a dark basement. I haven't figured out how all the buttons work yet. I'm on a low sodium diet, and am constantly having to calculate mgs for my spreadsheets. It's pretty easy to carry upstairs to the kitchen with me.