Bowers & Wilkins PX7 Manual page 5

The following buttons on the right ear piece to control phone call functionality:
Function
Answer or end call
Answer an incoming call
Decline an incoming
Switch between two calls
Merge two calls
Toggle Mute
2.3 Noise Cancellation & Ambient Listening
PX7 headphones features our next generation adaptive noise cancellation technology. The Noise
Cancellation button on the left ear piece control this feature.
Mode What is it
High Noise cancellation & playback tuning suitable for noisy environments
Low Noise cancellation & playback tuning suitable for low noise environments
Headphone senses the surrounding environment & automatically adjusts the level of Noise
Auto
cancellation & tuning for best experience
Off Noise cancellation turned off
Function
Enable/Disable Noise Cancellation
Adjust Noise Cancellation Modes
5
Action
Press the Multi-function button once
When incoming call occurs, press the Multi-function button once
When incoming call occurs, hold the Multi-function for 2 seconds
With two calls active, press the Multi-function button twice
With two calls active, hold the Multi-function button for 1 second
While on a call, press the Multi-function button three times
Action
Hold the Noise Cancellation button for 2 seconds
Single press the Noise Cancellation button to cycle between