The ornamental design for a vibrationdevice, as shown and described.
FIG. 1 is a perspective view of a vibration device according to the invention;
FIG. 2 is a front elevation view of the vibration device of FIG. 1;
FIG. 3 is a rear elevation view of the vibration device of FIG. 1;
FIG. 4 is a left side elevation view of the vibration device of FIG. 1;
FIG. 5 is a right side elevation view of the vibration device of FIG. 1;
FIG. 6 is a top plan view of the vibration device of FIG. 1; and,
FIG. 7 is a bottom plan view of the vibration device of FIG. 1.
The broken line disclosure, as well as line shading in parts of the drawings are included for the purpose of illustrating use and environment and form no part of the claimed design.