FIG. 1 is a front right top perspective view of a first embodiment of an earphone showing our new design;

FIG. 2 is a rear right top perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view thereof;

FIG. 6 is an opposite side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front right top perspective view of a second embodiment of an earphone showing our new design;

FIG. 10 is a rear right top perspective view thereof;

FIG. 11 is a front elevational view thereof;

FIG. 12 is a rear elevational view thereof;

FIG. 13 is a left side elevational view thereof;

FIG. 14 is a right side elevational view thereof;

FIG. 15 is a top plan view thereof;

FIG. 16 is a bottom plan view thereof;

FIG. 17 is a front right top perspective view of a third embodiment of an earphone showing our new design;

FIG. 18 is a front elevational view thereof;

FIG. 19 is a rear elevational view thereof;

FIG. 20 is a left side elevational view thereof;

FIG. 21 is a right side elevational view thereof;

FIG. 22 is a top plan view thereof;

FIG. 23 is a bottom plan view thereof;

FIG. 24 is a front right top perspective view of a fourth embodiment of an earphone showing our new design;

FIG. 25 is a front elevational view thereof;

FIG. 26 is a rear elevational view thereof;

FIG. 27 is a left side elevational view thereof;

FIG. 28 is a right side elevational view thereof;

FIG. 29 is a top plan view thereof;

FIG. 30 is a bottom plan view thereof;

FIG. 31 is a front right top perspective view of a fifth embodiment of an earphone showing our new design;

FIG. 32 is a front elevational view thereof;

FIG. 33 is a rear elevational view thereof;

FIG. 34 is a left side elevational view thereof;

FIG. 35 is a right side elevational view thereof;

FIG. 36 is a top plan view thereof;

FIG. 37 is a bottom plan view thereof;

FIG. 38 is a front right top perspective view of a sixth embodiment of an earphone showing our new design;

FIG. 39 is a front elevational view thereof;

FIG. 40 is a rear elevational view thereof;

FIG. 41 is a left side elevational view thereof;

FIG. 42 is a right side elevational view thereof;

FIG. 43 is a top plan view thereof;

FIG. 44 is a bottom plan view thereof;

FIG. 45 is a front right top perspective view of a seventh embodiment of an earphone showing our new design;

FIG. 46 is a rear right top perspective view thereof;

FIG. 47 is a front elevational view thereof;

FIG. 48 is a rear elevational view thereof;

FIG. 49 is a left side elevational view thereof;

FIG. 50 is a right side elevational view thereof;

FIG. 51 is a top plan view thereof; and,

FIG. 52 is a bottom plan view thereof.

The portions indicated in broken lines are for illustrative purposes only and form no part of the claimed design.