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60 Chapter 4 Last, but Not Least
Battery Discontinue use of your battery if your MacBook Air is dropped or if your
battery appears crushed, bent, deformed, or damaged. Do not expose the battery to
temperatures above 212° F or 100° C. Do not remove the battery from your
MacBook Air. The battery should be replaced only by an Apple Authorized Service
Provider.
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 system 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 a failure of the computer system could lead to
death, personal injury, or severe environmental damage.