Summary: I thought this model remembered your last number when it woke from being asleep, but it does not. It's a small issue I have with it. Other than that I like it quite a bit and just used it for a professional exam that only allows these types of calculators. I like that it has a built in battery along with the solar.
Excerpt: This calculator fit perfectly into my work environment. I needed a simple calculator without scientific functions. I also needed a device with some sort of protective cover that would open and stay open and this little guy fit the bill perfectly. It also has the added bonus of having solar cells built in to help keep the battery going for a long time. Did I mention that it also has a very large display to help out my aging eyes.
Excerpt: This calculator was purchased for my son for 7th grade math class. I purchased it because casio is a well known brand and because it's light, compact, has the functions he needs at this time. The item I liked the most was the inclusive case. This calculator also has a solar and battery back up feature. I also like the on/off function that many solar calculators don't have.
Summary: Yes, for those who have asked, the battery is in there. It is a small round battery and the packaging says to go to the dealer to get the battery replaced. It is like a watch battery. Some of them last forever. What is wrong with this calculator is that it is supposed to hold the last entry up to 8 minutes, according to the packaging. It holds for less than a minute and then completely shuts off.