Very good but I would prefer it to have a battery that stores some energy while it is exposed to light. The positive thing, of course, is that you will never run out of batteries.

Good and solar-powered!!! I had it during my college years and with this machine I passed all my exams, until I lost it when I took my last exam.

Positives: It is solar-powered, so you take care of the environment, and you don't have to worry about batteries.

Negatives: It would be nice to have an internal backup battery that would charge from the sun, so you can use it comfortably in low-light conditions.

Overall, it is a good machine, with very good dimensions. I remember it used to be thinner in the past, but the dimensions it has now are fine!