Samsung SM-R323 Gear VR User Manual page 19

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Listening to sound at high volumes can cause irreparable damage
to your hearing. Background noise, as well as continued exposure
to high volume levels, can make sounds seem quieter than they
actually are. Due to the immersive nature of the virtual reality
experience, do not use the Gear VR with the sound at a high
volume so that you can maintain awareness of your surroundings
and reduce the risk of hearing damage.
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