Sony VAIO VPCZ2 - Manual (Page 105)

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Using Peripheral Devices >
Using the Noise Canceling Headphones
Connecting the Noise Canceling Headphones
To connect the noise canceling headphones
Plug the headphones cable into the headphones jack i.
The icon appears on the taskbar to indicate that the noise canceling function is enabled and a balloon message pops
up from the icon.
✍
When the icon is on the taskbar, the noise canceling function is disabled. Right-click the icon and select Enable Noise Canceling Function from
the menu.