This calculator works standalone including via solar cell or battery, or with a computer via USB. When attached via USB to a PC/Mac, it has a two mode switch for keying in numbers, or for calculating on the side (standalone calculator mode). If in calculator mode, you can still use the "SEND" button to key in your current result to the attached computer for you, but the rest of the time it keeps the results to itself (no keying).When I received this calculator, the box indicated Windows only (OSX was not mentioned under requirements). I was prepared to be disappointed. I took a chance, and this product just works (no drivers)!
It could've been a disaster with such a hybrid device, but the trackball, keypad, backspace, tab, cursor, and everything just seem to work. Plus (at first I thought USB cable was not included), it includes a nifty self-storing USB cable that retracts into the base. The battery is built-in and rechargeable (factory (and user?) replaceable), and it has a solar cell for working off light.
There are a few shortcomings. I don't know if there's a calculator standard keypad size, but the keys seem a little close together compared to a normal keyboard, but still OK. The touch is softly tactile.
The manual doesn't have much to cover but still leaves a bunch to be desired. There are some a few sophisticated features which the manual does not explain fully (at least to my satisfaction) but which seem standard enough: the rounding switch (up, 5/4, down), decimal point setting (+,4,3,2,1,0,F[loating point]), and tax aids. I think the floating point could've used more explanation of when the + mode would be useful. It's confusing that they're not explained in some significant detail since they're somewhat unique features. That's picky, but for such a nifty product, solid documentation would be extra polish.
Overall, I'm quite impressed and pleased with this unorthodox (yet surprisingly familiar) and versatile calculator.
Well, the tiny trackball was quirky and would move all over the screen.
The keys are so close together and small that I could not accurately enter numbers.
I sent it right back.
Many keypads like this one have small numbers so if you use the pad for data entry be careful.
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