You would need to crack them open and look up the datasheet for the wireless or infrared tranceiver module. Example: http://www.semiconductorstore.com/pdf/newsite/nordic/nRF24Z1.pdf Then you will need to design a unit capable of sending wireless signals that the chip can use, possibly by sourcing another unit of the tranceiver. Then you will need to design a USB interface (I assume you are connecting this to a computer), and program a driver to use with your operating system of choice. It would be a nontrivial project. It would be easier to buy a USB radio transmitter and integrate a small radio into the headphones, circumventing the original interface entirely.