FIG. 1 is an isometric front, bottom view of a first embodiment of a wireless sensor without display; FIG. 2 is an isometric rear, top view thereof; FIG. 3 is a back view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a front view thereof; FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof.