I ordered another calculator to replace this one. I'll keep it as a backup but the shape of this thing is horrible, it rocks around due to the curves when sitting on a desk and trying to use it, and is not ergonomic when holding it. Also due to the extra width and slippery shiny plastic, it is impossible to use one handed as when you reach your thumb across to hit a button on the far side, it slides out of your hand because there is no texture to it.