Gravity GR50WH4-Pack Single Channel Universal IR Infrared Wireless Foldable In-Car Headphone for TV Video Audio Listening Come with 4 pieces of Single Channel IR Wireless Headphone! Come with 3.5mm Auxilary input for extra device hook up (cord not included) Enjoy cable free music listening in your road trip All the kids will enjoy great entertainment with their favorite movie, music, etc Great for family trip, listing to audio book, mp3 music and DVD movie in the car