... connect with TV, VCR, VCD DVD or Audio System 2:Foldaway Design 3:Crystal Clear Sound ... with TV, VCR, VCD, DVD or Audio System-Use Several Headphones Simultaneously with one transmitter -Active Noise ... Reduction System For Crystal Clear Sound-Foldaway Design-Net ... wtih TV,VCR,VCD,DVD or audio system6) Distortion:<1%7) Use 2*AAA Batteries( Not included) ...