Sennheiser Set 820 S Bedienungsanleitung Seite 39

WARNING: Volume up? - No!
When people use headphones, they tend to choose a
higher volume than with loudspeakers. However, if your
hearing has deteriorated and you need to rely on an
assitive listening system, please avoid listening at high
volume levels for a long time. Please protect your hearing.
ATTENTION: Danger of short circuit!
Neither transmitter nor receiver must get wet or excessively
moist, e.g. due to spilled liquids or use in damp rooms.
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