FIG. 1 is a first perspective view of a wireless headset showing the new ornamental design;

FIG. 2 is a second perspective view thereof, the second perspective view opposite the first perspective view;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof, a left side elevational view the same as the right side view;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.