Listening to music using the audio cable
Use the included audio cable to connect to an audio device that is not equipped with Bluetooth, when Bluetooth is not allowed or the battery runs out.

The noise cancelling function can be used when the headphones are connected via the audio cable as long as the battery remains charged. link
Call and playback operations using Bluetooth are disabled when the headphones are connected via the audio cable.
Using the audio cable with remote control mic
An audio cable with a remote control mic as well as an audio cable are included with these headphones. Use the audio cable with the remote control mic to connect with remote control-compatible playback devices to play and pause music, as well as receive, make and hang up phone calls.

Audio playback/pause
Press the remote control button.
Answer / hang up phone call
Press the remote control button when a call is incoming or while on a call.
Enabled remote control operations may vary depending on the device connected, and mic operations may not work correctly.