SanDisk Sansa e200 - Manual (Page 53)

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• Exposure or repeated exposure for an extended period of time to music and
other sounds that are too loud can cause damage to your hearing resulting in
temporary or even permanent “noise induced hearing loss”.
• Symptoms of hearing loss increase gradually with prolonged exposure at high
levels of loudness.
Initially, you may not even be aware of the loss unless detected with a hearing
test.
HEARING LEVELS
To help you understand what may be considered a safe hearing level, the
following examples are included for your reference.
Examples of Typical Approximate Sound level
Sound Levels in Decibels (dB)*
Refrigerator humming 40
Normal conversation 60
City traffic 80
Motorcycles and lawnmowers 90#
Rock concerts 110-120#
Firearms 120-140#
* dB -A decibel (dB) is a unit of relative measurement of the strength of
sound wave. In decibels (dB), a measured signal level doubles with every
additional 3 dB.
# - These sound decibel levels are considered harmful under extended
exposure.
Information courtesy of the National Institute of Deafness & Other
Communication Disorders (NIDCD)