it has Tax and Currency conversion, Function & Command Signs, On and Off buttons, Profit margin %, +,-, Key Rollover .
You don't need a battery in a well lit room. My room is l=dim and this wirks fine, however, if the solar panel is shadowed by your hand or anything, it goes off. To be in the safe side, you can put one AA battery.
This has wider keys which is helpful for faster calculations coz they are big enough for my finger tips.
Overall, this is a good item.
You can buy this here:
https://www.amazon.ca/gp/product/B01B5MU6JG/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
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