Apple MB325LL Manual - Page 60

Avoid Hearing Damage WARNING: 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, then stop listening and have your hearing checked. The louder the volume, the less time required before your hearing can be affected. Hearing experts suggest that to protect your hearing, you should:  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 to you Understanding Ergonomics Here are some tips for setting up a healthy work environment. Chair An adjustable chair that provides firm, comfortable support is best. Adjust the height of the chair so that your thighs are horizontal and your feet are flat on the floor. The back of the chair should support your lower back (lumbar region). Follow the manufacturer's instructions for adjusting the backrest to fit your body properly. 60 Chapter 5 Last, but Not Least