FIG. 1 is a perspective view of the hearing aid showing my new design;
FIG. 2 is a front side view thereof;
FIG. 3 is a rear side view thereof;
FIG. 4 is a left side view thereof, the right side view being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken lines in FIG. 3 are included for the purpose of illustrating a portion of the hearing aid that forms no part of the claimed design