Sony VAIO VGN-P500 - Manual (Page 62)

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Using Peripheral Devices
Using the Noise Canceling Headphones
A pair of noise canceling headphones may be supplied with your computer depending on the model you purchased.
The noise canceling headphones are equipped with a built-in microphone that catches ambient noise and outputs an
antiphase sound to reduce the noise.
See the online specifications to find out whether the noise canceling headphones are supplied with your computer.