Polaroid 20070918 - Manual (Page 22)

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System Connections
Connecting Earphones
Connect earphones to the earphone jack on the jack panel of the unit for listening.
When earphones are connected, the television will automatically mute internal speaker output.
Note:
Excessively loud volume could damage your hearing. Please turn down the television volume
before connecting earphones, and then raise the volume to a comfortable level.