The box AK 10 User Manual page 13

Notes on radio transmission
This equipment uses a frequency range that is free of charge and registration within the
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European Union.
For more information, please visit: http://www.thomann.de.
When operating, make sure that transmitter and receiver are set to the same channel.
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Never set more than one transmitter to the same channel.
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Make sure that no metal objects are located between transmitter and receiver.
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n Avoid interference by other radio and in-ear systems.
AK 10
Safety instructions
13