The ornamental design for a smokedetectorcover, as shown and described.
FIG. 1 is a perspective view of the smoke detector cover.
FIG. 2 is a front elevation view thereof.
FIG. 3 is a first side elevation view thereof, the opposing side of the smoke detector cover being a mirror image thereof; and,
FIG. 4 is a second side elevation view of the smoke detector cover rotated ninety degrees from the view shown in FIG. 3, the opposing side of the smoke detector cover shown in FIG. 4 being a mirror image thereof.
The rear view of the smoke detector cover illustrated in FIGS. 1-4 forms no part of the claimed design.