Toyota 2009 4runner Owner's Manual page 295

3-2. Using the audio system
Type A and B
Type C
Operating portable audio devices connected to the audio system
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The volume can be adjusted using the vehicle's audio controls. All other
adjustments must be made on the portable audio device itself.
When using a portable audio device connected to the power outlet
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Noise may occur during playback. Use the battery power source of the por-
table audio device to reduce noise.
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Press .