FIG. 1 is a perspective view of a mouse in accordance with the new design; FIG. 2 is a front side view of the mouse of FIG. 1; FIG. 3 is a back side view of the mouse of FIG. 1; FIG. 4 is a left side view of the mouse of FIG. 1; FIG. 5 is a right side view of the mouse of FIG. 1; FIG. 6 is a top plan view of the mouse of FIG. 1; and, FIG. 7 is a bottom plan view of the mouse of FIG. 1.