Twelve South AirFly Pro Quick Start Guide (RX, Receive)
https://www.twelvesouth.com/products/...
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.