Smoke Detector

FIG. 1 is a perspective view of a smoke detector. FIG. 2 is perspective view of a portion of FIG. 1 . FIG. 3 is a top view of FIG. 1 . FIG. 4 is top view of a portion of FIG. 3 . FIG. 5 is a bottom view of FIG. 1 . FIG. 6 is a first side view of FIG. 1 . FIG. 7 is a second side view of FIG. 1 . FIG. 8 is a third side view of FIG. 1 ; and, FIG. 9 is a fourth side view of FIG. 1 . The dash-dash broken lines in the Figures depict portions of the smoke detector that form no part of the claimed design. The dash-dot-dot-dash lines in the figures are for the purpose of illustrating the enlarged view indicators and form no part of the claimed design. The shade lines in the Figures show contour or the flatness of a surface, and not surface ornamentation.