Noise cancellation and Transparency mode
Noise cancellation reduces outside noise so you can focus on your music.
Transparency mode passes outside sound into your earbuds so you can hear conversations and your surroundings. Noise cancellation is enabled by default.
You can toggle between Noise cancellation and Transparency mode via the touch buttons or in-app:
Touch buttons
You can configure the touch buttons to enable/disable Transparency mode in the Denon Headphones app. This will toggle between Transparency mode and Noise cancellation.
In-app
Tap the Noise cancellation or Transparency button on the homepage of the Denon Headphones app. Tap the Off button to disable Noise cancellation and Transparency.