The ornamental design for a wirelessspeaker, as shown and described.
FIG. 1 is an enlarged front elevational view of a wireless speaker showing my new design;
FIG. 2 is an enlarged rear elevational view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is an enlarged perspective view thereof;
FIG. 8 is an enlarged view of portion 8 shown in FIG. 1; and,
FIG. 9 is an enlarged view of portion 9 shown in FIG. 2.
The broken lines shown in the drawings represent unclaimed portions of the wireless speaker and form no part of the claimed design. The interior structural features seen behind the speaker grill do not form part of the claimed design.