The ornamental design for a pair of earphones, as shown and described.
FIG. 1 is an isometric view of a pair earphones from one perspective, showing our new design.
FIG. 2 is an isometric view thereof from another perspective.
FIG. 3 is a left side elevational view thereof.
FIG. 4 is a right side elevational view thereof.
FIG. 5 is a front elevational view thereof.
FIG. 6 is a rear elevational view thereof.
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
Stippling in the drawings represent the three-dimensional contours of the design, and are not intended to indicate surface decoration. The broken lines in the drawings depict portions of the pair of earphones that form no part of the claimed design.