FIG. 1 is a perspective view of a wireless receiver unit for an irrigation flow control device according to our new design, in which all of an antenna, a panel on the front side, a support rib on each of the left and right sides, four indicator openings on a top surface, electrical wires and external threads on a screw cap are illustrated in broken lines in this and the following views, and form no part of the claimed design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right side view elevation thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.