Portable digital audio player

FIG. 1 is a top plan view of a digital audio player having our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top/left side perspective view thereof; and,

FIG. 8 is a top/right side perspective view thereof.

The broken lines, which define the boundary of the claimed design, form no part thereof. The broken lines environmental are for illustrative purpose only and form no part of the claimed design.