The ornamental design for a beacondevice, as shown and described.
FIG. 1 is a perspective view of a beacon device showing the new design.
FIG. 2 is a top view a beacon device showing the new design.
FIG. 3 is a bottom view of a beacon device showing the new design.
FIG. 4 is an elevation view of a beacon device showing the new design.
FIG. 5 is an elevation view of a beacon device showing the new design; and,
FIG. 6 is an exploded view of a beacon device showing the new design.
The broken line showing of internal elements is included for the purpose of illustrating portions of the “article” and forms no part of the claimed design.