This is the AirFly Pro: a handy adapter that lets you connect wireless headphones to any headphone jack. In fact, it lets you pair two headphones, so you can share your movie or music with a friend. The AirFly Pro lasts over 25 hours on battery.
This gadget lets you use your headphones in-flight, in the gym with exercise machines, and in your car. You can find out more about it here.