Etymotic Research hf2, Руководство пользователя

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Caution
Consult an audiologist or physician if you have excessive ear wax,
difficulty inserting the eartips, or discomfort after prolonged use.
hf2 h earphones exclude most external sounds.
While
driving, always leave one ear open . It is unsafe to use in-ear
earphones while operating a motorized vehicle, operating
machinery, bicycling or jogging, because you may not be alerted
to potential danger.
Do not use the headset at excessively loud levels. Research
confirms that earphones that seal the ear canal allow listeners to
choose safer listening levels. Noise-induced hearing loss is a
function of exposure time, the average sound level and the peak
of very loud sounds. Sealed eartips and lower listening levels
allow for longer periods of safe listening time.
Performance
A full bass response depends on proper earphone insertion. For
best results, earphones must seal in the ear canals.