The Mégane II Owners' Club

What!! How is that even possible? The button is not necessarly related to make something work or disable something from working .. I mean it could be something like for feul economy?? Right? Its hard to mesure that at the time

I don't think so..But i thought it's in all renault megane 2008 cars isn't it? and you know what it's used for?

anyone ?

hello,
what is this button (in attached image)
its megane 2008

thank you