The ornamental design for a pair of bluetoothearphones, as shown and described.
FIG. 1 is a rear and left side perspective view of a pair of bluetooth earphones showing my new design;
FIG. 2 is a front and left side perspective view thereof, shown in an environment of use;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The dashed or broken lines shown in the drawings depict portions of the pair of bluetooth earphones in which the design is embodied that form no part of the claimed design.