Calculator with curved surface for attachment to computer mouse has underside shaped to fit onto hand rest surface of mouse

摘要

The calculator (5) has a curved case (6) with a shaped underside so that it can be positively fitted to the region of a computer input device on which the user's and is rested. The keys and display of the calculator may be recessed into the calculator case. The calculator may be releasably attached to the input device. The case may be flexible.