Master & Dynamic MW65 Manuel De L'utilisateur page 9

PREVENTION OF NOISE-INDUCED HEARING LOSS
NIHL is a preventable condition caused by both one-time and extended exposure to
excessive decibel (dB) levels. This harm to sensitive inner ear structures is
irreversible and people of all ages can be affected. Damage can happen in a single
event or gradually over time. One-time exposure to sounds louder than 110
decibels and extended exposure to sounds over 85 decibels can cause harm.
Indicators of NIHL include hearing loss and tinnitus, a condition of sensing
constant ringing, buzzing or roaring. The NIDCD (National Institute on Deafness
and Other Communication Disorders) offers this simple rule of thumb: avoid sound
exposure that is "too loud, too close or too long." Here are some general
references to sound levels that occur in everyday life: refrigerator humming (45
dB); normal conversation (60 dB); city traffic (85 dB); motorcycles (95 dB); an MP3
player at full volume (105 dB); sirens (120 dB); firecrackers (150 dB).
USER MANUAL MW65 Active Noise-Cancelling Wireless Over-Ear Heaphones 9