The ornamental design for a handsetspeaker, as shown and described.
FIG. 1 is a perspective view of a handset speaker 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; and,
FIG. 7 is a bottom view thereof.
The broken lines in the figures showing the unclaimed portions of a handset and the broken lines shown on the handset speaker including the unshaded regions therein are for illustrative purposes only and form no part of the claimed design.