TwelveSouth AirFly Pro Deluxe

Highlights: Connects wireless Bluetooth headphones to any 3.5 mm audio jack, connects two headphones simultaneously for shared listening, streams music from your smartphone to an audio IN jack in the car, at home, or on a boat. The internal battery lasts over 16 hours and charges via USB-C. Includes USB charging cable, premium travel case, and 2-pin airline adapter.

AirFly Pro not only acts as a receiver for 1 to 2 wireless headphones but can also receive music from a Bluetooth device (e.g., iPhone, smartphones) and transmit it through the audio jack. This allows you to listen to your own music in the car, on a boat, or at home with any non-Bluetooth speaker. With just the press of a button, AirFly Pro switches back to headphone mode. The perfect travel companion – stream your music in the car and then switch to sending mode when you're in the air, so you can use your own AirPods or other Bluetooth headphones with the in-flight entertainment system.

Possible scenario: You and your friend are watching a movie together on the plane, and later you can listen to your music in your car. The charging time to fully charge the AirFly from empty is about 2 hours.