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The device is equipped with 4 touch keys, all of which have been marked by
the symbol . The functions allocated to them may vary in dependence on
the operation requirements. The related function is being indicated on the
display which exists above the corresponding keys. A special protective
function helps prevent an inadvertent activation of the touch keys. This
function is activated 20 seconds after any of the touch keys has last been
activated. Actuating any of the touch keys deactivates this function again for
2 seconds.
3. Operating instructions
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