Doorbell

FIG. 1 is a front perspective view of a doorbell showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a cross-sectional view taken along line 8 - 8 of FIG. 3 .

The broken lines depicting the remainder of the doorbell form no part of the claimed design.