There is nothing particularly fantastic or different about this calculator. It does what it should, has a good layout, and the "right" size to it. THIS is the calculator I have used at work for 15 years, and have become so tuned to it's size and layout...that I fumble with ANY other calculator. Fast forward 15 years and the one I used at work was smashed....and where we order supplies from, can no longer get this model. I fumbled with others for a few weeks, and decided to buy my own from Amazon....I'm back in my groove. LOL I saw a question asked about the model as to what size battery it takes....this strikes me as a question not worth asking. This calculator is solar power with battery for backup. My previous calculator (the one that was smashed) worked for 15 YEARS on the same battery. The cost of the battery is probably half the price of the calculator, and if you DID have to replace it every 15 years or so (I'm not convinced)....just treat yourself to a new one.