Velodyne vFree User's Manual And Warranty - page 4
2
Sound
Noise Level (dB)
Effect
Normal breathing
10
Just audible
Whisper
30
Very quiet
Normal conversation
60-65
Comfortable hearing levels are under
60 dB
Vacuum cleaner, hair dryer
70
Intrusive; interferes with telephone
conversation
Average city traffic
80
Annoying; interferes with conversation;
constant exposure may cause damage
Lawnmower, food blender
85-90
85 dB is the level at which hearing
damage (8 hrs) begins
Garbage truck, cement mixer
100
No more than 15 minutes of
unprotected exposure recommended for
sounds between 90-100 dB
Stereos (over 100 watts), thunderclap
(near)
110-125
Regular exposure to sound over 100
dB of more than one minute risks
permanent hearing loss
Jet engines (near)
140
Threshold of pain begins around 125
dB
http://www.nidcd.nih.gov/health/education/teachers/pages/common_sounds.aspx
Please listen safely
Listening with vFree headphones at high volumes may affect your hearing, including causing permanent damage.
Ringing in your ears or other discomfort can indicate that the volume is too high.
Hearing health is critical to enjoyment and the quality of life. Protect your hearing by listening with your vFree
headphones in a responsible manner that protects your long term hearing health. Velodyne Acoustics, Inc. is not
responsible for hearing loss or damage resulting from the use of this product.