The ornamental design of a headphonedevice, as shown and described.
FIG. 1 is a side view of a headphone device in accordance with the present invention, the other side is a mirror image of FIG. 1;
FIG. 2 is a top view of the headphone device in FIG. 1;
FIG. 3 is a front view of the headphone device in FIG. 1; and,
FIG. 4 is a front perspective view of the headphone device in FIG. 1.
The broken lines showing the remainder of the headphone device are directed to environment. None of the broken lines form a part of the claimed design. The oblique lines indicate a transparent or translucent material.