Product convergence has been going on for some time in the gadget world, but as far as we're aware, this is the first time that anyone's tried to merge a computer mouse with a calculator.

The multi-tasking Canon X Mark I Mouse acts not only as a wireless laser mouse, but also as a personal calculator, complete with numberered buttons and a display.

The mouse can be user-locked to prevent accidental button-pressing during 'mouse' use, and comes with Bluetooth 2.0 connectivity, three click buttons and a scroll-wheel.

It'll be out in November, priced at £39.99.

We tracked the little blighter down at Photokina to take a closer look.  For a brand new gadget, it doesn't look terribly modern and it felt light and plasticy. Is a mouse-calculator combo something that people really need, or even want? The adage, 'just because you can, doesn't mean you should' springs to mind.

Is a combined mouse and calculator a touch of genius or just plain daft? Let us know what you think in the comments box.