Sony WH-L600 Help Manual page 28

Turn the headphones on, put it on, and adjust the volume.
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Note
Use the headphones within the signal transmission range.
Make sure not to turn up the volume too much during the quiet scenes of the movie. It may damage your ear when there is
sudden increase of volume (such as a scene with an explosion).
Related Topic
Using HDMI devices efficiently
RF signal transmission area
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