KeyAudio 2 Channel Folding IR Wireless Headphones for In Car DVD/TV Audio Video Rear Entertainment Systems includes 3.5mm Aux Cord - 4 Pack 4 Pack of Wireless IR headphones to enjoy in car listening without the hassle of cables. Perfect companion for a family road trip, but can also be used with aux cable to connect to any other device that has an aux port. Power Saving-Automatic shut off prevents batteries from draining when left on Headphones fold up for easy compact storage! These are Infrared Headphones and are not compatible with other frequency systems. 3.5mm Auxilary port. Allows plug in use on any Ipad/Pod, MP3 devices that uses a 3.5mm auxillary cord (cord not included) Two Channel IR Headphones allow for 2 people to watch different shows at the same time by switching the channel.