Apple MacBook Pro (Late 2007, 2.4/2.2 GHz) - Manual (Page 66)

66 Chapter 5 Last, but Not Least
Handling the battery Do not drop, disassemble, crush, incinerate, or expose the
battery to temperatures above 212° F (100° C). Stop using the battery if it appears
damaged in any way. Replace the battery only with an Apple-authorized battery for
this product. Dispose of used batteries promptly according to your local environmental
guidelines.
Avoiding 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 the failure of the computer system could lead to
death, personal injury, or severe environmental damage.