LEGRAND 672 43 Notice D'emploi page 11

Your control
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The Touch Control is an SCS control where traditional pushbuttons are
replaced by capacitive sensors.
Lightly touching the area of a sensor with your finger is like pressing
a button.
There is a blue LED in the middle of each button area; when you put
your finger on it, the intensity increases considerably and remains like
that until it moves away.
This effect confirms that the command has been sent.
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Touch Control