The ornamental design for a conferencingdevice, as shown and described.
FIG. 1 is a top, front side perspective view of a conferencing device showing our new design;
FIG. 2 is a top, back side perspective view thereof;
FIG. 3 is a bottom perspective view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a rear elevation view thereof;
FIG. 8 is a left side elevation view thereof; and,
FIG. 9 is a right side elevation view thereof.
The broken lines shown to be immediately adjacent to the shaded/contoured areas represent the bounds of the claim that form no part of the claimed design. The remaining broken lines illustrate portions of the conferencing device that form no part of the claimed design.