Canon's X Mark I : Combination of Mouse and Calculator

You can imagine, how can a mouse can be combined with a calculator? you do not need to tell you that it is impossible, because we already have a mouse that also functions as a calculator. Mouse is Canon's X-Mark I. Canon's X-Mark I computer is a device manufactured by Canon, which combines the mouse functions as well as a calculator.Is it a mouseulator? A calcouse? Whatever you call this bastard