SanDisk SDMX48192A70 User Manual - Page 53
Examples of Typical Approximate Sound level
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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) 53