We claim the ornamental design for a wristband for portable electronic device, as shown and described.
FIG. 1 is a front perspective view of a wristband for portable electronic device showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof; and,
FIG. 9 is a cross-sectional view thereof taken vertically through line 9-9 in FIG. 2.
The dash-dash broken lines in the drawing figures depict portions of the wristband for portable electronic device that form no part of the claimed design. The dot-dash broken lines in the drawing figures represent a boundary of the claimed design and form no part thereof.