The ornamental design for a wirelessspeakerbox, as shown and described.
1. Wireless speaker box
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Perspective
1.1 is a front elevation view of wireless speaker box showing our new design; 1.2 is a back elevation view thereof; 1.3 is a left side elevation view thereof; 1.4 is a right side elevation view thereof; 1.5 is a top plan view thereof; 1.6 is a bottom plan view thereof; and 1.7 is a perspective view thereof; the wireless speaker box is mainly used for playing multimedia sound.
The portions of the wireless speaker box shown by coloring in Figures 1.2 and 1.6 form no parts of the claimed design.