This bi-directional cable can be used with both 3.5mm audio-out and audio-in ports, allowing you to connect your AirPods Max or Beats Solo Pro headphones to 3.5mm audio sources, or to connect your iOS or iPadOS device to speakers with 3.5mm audio ports.
Using AirPods Max or Beats Solo Pro
Connect your AirPods Max or Beats Solo Pro headphones to the audio-out port on an airplane, iPhone, iPad, Mac, or another device.
Using with iPhone or iPad
Connect your iOS or iPadOS device to the audio-in port on your car stereo or another speaker.