This is a full-size calculator, affordable, decent quality, with a moderate to good keyboard and the advantage of battery operation.

It cannot be compared to regular full-size calculators when it is powered by an adapter.
The screen is slow, slightly indistinct, momentarily flickers in the result, and the device and keyboard are not as sturdy as, for example, the Casio DR-420 we have in the office, or the larger Olivetti and especially the Citizen 350DPN, which is also the best calculator we have.

For those who do not want it for battery use, prefer the Casio FR-2650RC. Unfortunately, it only comes in white, but it is the same calculator without batteries, with a much better screen and responsiveness.

Very good calculator with many more capabilities than one might expect. Large clear and readable screen. As a disadvantage, I could mention the sound as the use of a ribbon instead of an ink ribbon for printing creates more noise.