Apple MC233LL/A, MB003LL/A manual  Avoid turning up the volume to block out noisy surroundings

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:

ÂLimit the amount of time you use earbuds or headphones at high volume.

ÂAvoid turning up the volume to block out noisy surroundings.

ÂTurn 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.

60Chapter 4 Last, but Not Least