Twelve South

Twelve South Adapter - AirFly SE

Use wireless headphones with any headphone jack.

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AirFly is a wireless adapter that lets you use your wireless headphones or earbuds in places that only have a headphone jack, like airplanes and treadmills. Plug this tiny transmitter into the headphone jack to listen to in-flight movies or TVs at the gym.
 
Up to 20+ hour battery life outlasts even the longest international flight