Hearing Safety; Built-In Battery Care; Trademarks - Philips 4000 Series User Manual

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Hearing safety

Listen at a moderate volume
To establish a safe volume level
Listen for reasonable periods of time
Using headphones at a high volume
can impair your hearing. This product
can produce sounds in decibel ranges
that may cause hearing loss for a
normal person, even for exposure
less than a minute. The higher
decibel ranges are offered for those
that may have already experienced
some hearing loss.
Sound can be deceiving. Over time
your hearing 'comfort level' adapts
to higher volumes of sound. So after
prolonged listening, what sounds
'normal' can actually be loud and
harmful to your hearing. To guard
against this, set your volume to a
safe level before your hearing adapts
and leave it there.
To establish a safe volume level
Set your volume control at a low
setting.
Slowly increase the sound until you
can hear it comfortably and clearly
without distortion.
Listen for reasonable periods of
time
Prolonged exposure to sound, even
at normally safe levels, can also cause
hearing loss.
Be sure to use your equipment
reasonably and take appropriate
breaks.
Be sure to observe the following
guidelines when using your
headphones
Listen at reasonable volumes for
reasonable periods of time.
Be careful not to adjust the volume
as your hearing adapts.
Do not turn up the volume so high
that you can't hear what's around
you.
You should use caution or
temporarily discontinue use in
potentially hazardous situations.

Built-in battery care

The battery can be charged and
discharged hundreds of times, but
will eventually wear out.
If left unused, a fully charged battery
will lose its charge over time.
Leaving the product in hot or cold
places, such as in a closed car in the
summer and winter conditions, will
reduce the capacity and lifetime of
the battery.
Always try to keep your device in
a cool, moisture-free environment
that's less than 32°C. A product with
a hot or cold battery may not work
temporarily, even when the battery is
fully charged. Battery performance is
particularly limited in temperatures
well below freezing.

Trademarks

The Bluetooth® word mark and logos
are registered trademarks owned
by Bluetooth SIG, Inc. and any use
of such marks by MMD Hong Kong
Holding Limited is under license. Other
trademarks and trade names are those of
their respective owners.
EN
5

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