Twelve south airfly pro is a wireless headphone adapter that lets you use your favorite wireless headphones or earbuds in places that only have a headphone jack - like airplanes and treadmills. Plug this tiny transmitter into a headphone jack to listen to in-flight movies or the tvs at the gym. Airfly pro lets two people listen to the same soundtrack, podcast or music with their favorite noise-cancelling headphones or airpods.