Flashing light on centre control panel when headlights on

I just bought a 2009 Dodge Caliber, and
when I turn my head lights on there is a
button on my centre panel by the gear shift
that flashes 3 little lights. It goes off when I
turn my high beams off. Just wondering if
this is just a feature to indicate my lights are
on, or what .. clicking the button changes
nothing , and it does not flash my running
lights are on or my high beams.