Apple MacBook Pro (17-inch, Late 2011) - Manual (Page 74)

74 Chapter 5 Last, but Not Least
Hearing damage Permanent hearing loss may occur if earbuds or headphones are
used at high volume. You can adapt over time to a higher volume of sound that may
sound normal but can be damaging to your hearing. If you experience ringing in your
ears or muffled speech, stop listening and have your hearing checked. The louder the
volume, the less time is required before your hearing could be affected. Hearing experts
suggest that to protect your hearing:
 Limit the amount of time you use earbuds or headphones at high volume.
 Avoid turning up the volume to block out noisy surroundings.
 Turn the volume down if you can’t hear people speaking near you.
High-risk activities This computer is not intended for use in the operation of nuclear
facilities, aircraft navigation or communications systems, air traffic control systems, or
for any other uses where the failure of the computer could lead to death, personal
injury, or severe environmental damage.
Laser Information for Optical Disc Drives
WARNING: Making adjustments or performing procedures other than those specified
in your equipment’s manual may result in hazardous radiation exposure.
The optical disc drive in your computer contains a laser that is safe in normal use but
that may be harmful to your eyes if disassembled. For your safety, have this equipment
serviced only by an Apple Authorized Service Provider.