US D651530 S1
The ornamental design for a thermostat device, as shown and described.
FIG. 1 is a top perspective view of the thermostat device showing my new design;
FIG. 2 is a top view of the thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a front view thereof.