This is the Combimouse, a two-unit keyboard that servers also as a mouse. The Combimouse is a standard QWERTY keyboard consists of two parts. The left unit is stationary and provides the function of the left hand side of a conventional QWERTY keyboard while the right unit has a similar mass and centre of gravity to a conventional mouse.
The Combimouse has been tested for usability by Wichita State University. It has a has a similar grip comes with a scroll wheel and multimedia keys on the left unit.
Two short videos of the Combimouse: