Sennheiser HMEC 460 Instructions For Use Manual page 6

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Protect the headset from humidity. Only use a slightly damp cloth to clean the
headset. For information on how to clean the headset, contact your Sennheiser agent.
Intended use of the headset
Intended use includes:
having read and understood these instructions, especially the chapter "Safety
instructions".
using the headset in helicopters, propeller and turboprop aircraft and within the
operating conditions and limitations described in these instructions.
Improper use
"Improper use" means using the headset other than as described in these instructions,
or under operating conditions which differ from those described herein.