FIG. 1 is a perspective view of a first embodiment of a Bluetooth headphone showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear devotional view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a perspective view of a second embodiment of the Bluetooth headphone showing my new design;
FIG. 10 is a front elevational view thereof;
FIG. 11 is a rear elevational view thereof;
FIG. 12 is a left side elevational view thereof;
FIG. 13 is a right side elevational view thereof;
FIG. 14 is a top plan view thereof;
FIG. 15 is a bottom plan view thereof;
FIG. 16 is an enlarged view of portion 16 shown in FIG. 9;
FIG. 17 is a perspective view of a third embodiment of the Bluetooth headphone showing my 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 perspective view of a fourth embodiment of the Bluetooth headphone showing my new design;
FIG. 25 is a front devotional 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 perspective view of a fifth embodiment of the Bluetooth headphone showing my 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 perspective view of a sixth embodiment of the Bluetooth headphone showing my 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; and,
FIG. 45 is an enlarged view of portion 38 shown in FIG. 38.
The broken lines in the drawings depict portions of the Bluetooth headphone that form no part of the claimed design.