Sennheiser ew 300 IEM Instruction Manual page 4

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Keep the devices away from central heating radiators and electric heaters.
Never expose them to direct sunlight.
Use the devices in dry rooms only.
Use a damp cloth for cleaning the devices. Do not use any cleansing agents
or solvents.
Attention! High Volume!
This is a professional transmission system. Commercial use is subject to the
rules and regulations of the trade association responsible. Sennheiser, as the
manufacturer, is therefore obliged to expressly point out possible health risks
arising from use.
This system is capable of producing sound pressure exceeding 85 dB(A).
85 dB(A) is the sound pressure corresponding to the maximum permissible
volume which is by law (in some countries) allowed to affect your hearing
for the duration of a working day. It is used as a basis according to the
specifications of industrial medicine. Higher volumes or longer durations
can damage your hearing.
At higher volumes, the duration must be shortened in order to prevent
damage. The following simple formula applies:
Double the volume = half the duration
An increase of 3 dB corresponds to doubling the volume; you can thus go by
the following table:
Maximum duration
8 hours
4 hours
2 hours
1 hour
30 minutes
15 minutes
8 minutes
4 minutes
2 minutes
1 minute
Pain threshold
The following are sure signs that you have been subjected to excessive noise
for too long a time:
You can hear ringing or whistling sounds in your ears.
You have the impression (even for a short time only) that you can no
longer hear high notes.
After using this system, your hearing is impaired for a short time.
In all of the above cases, you should consult a specialist or at least have your
hearing tested. Ear damage builds up gradually. Once the initial symptoms
have died down, you no longer perceive acute changes. In the long term,
however, the repeated effects of loud noises can cause severe hearing
impairment or even deafness.
at a sound pressure of:
85 dB
88 dB
91 dB
94 dB
97 dB
100 dB
103 dB
106 dB
109 dB
112 dB
120 dB