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72 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muedspeech,stoplisteningandhaveyourhearingchecked.Thelouderthe
volume,thelesstimeisrequiredbeforeyourhearingcouldbeaected.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trac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specied
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.