Swann P-6T4 User Manual page 44

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If you press the "Left" button, it will display the third channel in full screen.
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If you press the "Right" button, it will display the fourth channel in full screen.
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If you press the "Enter" button, it will display the four-divided channel.
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If you press the "Audio" button, it will switch the voice for corresponding channel in live display mode.
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Digital Video Recorder User Manual