This bi-directional cable can be used with both 3.5 mm audio-out and audio-in ports, allowing you to connect your AirPods Max or Beats Solo Pro headphones to 3.5 mm audio sources, or to connect your iOS or iPadOS device to speakers with 3.5 mm audio ports.

Connect your AirPods Max or Beats Solo Pro headphones to the audio-out port on an airplane, iPhone, iPad, Mac, or other device.

Connect your iOS or iPadOS device to the audio-in port on your car stereo or other speaker.