Szymanski, AaronBlonder, Greg2019-07-092019-07-092014-06-032014-06-032013-07-02Aaron Szymanski, Greg Blonder. 2014. "Headphones." U.S. Patent D706,241-S1.D706,241-S1https://hdl.handle.net/2144/36332CLAIM The ornamental design for headphones, as shown and described. FIG. 1 is a front perspective view of the headphones of the present invention showing my new design; FIG. 2 is a front side elevational view thereof; FIG. 3 is a back side elevational view thereof; FIG. 4 is a side elevational view thereof; FIG. 5 is another side elevational view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; FIG. 8 is perspective view of FIG. 1 in a folded position; FIG. 9 is a front side view of FIG. 2 in a folded position; FIG. 10 is a top plan view of FIG. 6 in a folded position; and, FIG. 11 is a bottom plan view of FIG. 7 in a folded position. The broken lines form no part of the claimed designPatent309046