Philips 15B1322Q11 - Manual (Page 7)

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N 2. Earphone Connection :
Connect your earphone plug (must be mini Jack type) to the
earphone connector on the left side of the monitor.
The speakers will be switched off when earphone is plugged in.
3. External Microphone Connection :
Connect your microphone plug to the microphone connector on
the left side of the monitor.
The internal microphone will be switched off when external
microphone is plugged in.