Headphone

<figref idref="DRAWINGS">FIG. 1</figref> is a perspective view of a headphone showing my new design;

<figref idref="DRAWINGS">FIG. 2</figref> is a front elevational view thereof;

<figref idref="DRAWINGS">FIG. 3</figref> is a rear elevational view thereof;

<figref idref="DRAWINGS">FIG. 4</figref> is a left side elevational view thereof;

<figref idref="DRAWINGS">FIG. 5</figref> is a right side elevational view thereof;

<figref idref="DRAWINGS">FIG. 6</figref> is a top plan view thereof; and,

<figref idref="DRAWINGS">FIG. 7</figref> is a bottom plan view thereof.

The broken lines depict environment that forms no part of the claimed design.