I have a newly installed MI424-WR Rev. E router and even though I was able to set it up and get it working on my own, I am courious about this large white button (which is apparently a switch since it clicks when pushed) which is labeled "Setup Wi-Fi protected". It glows orange when the unit is powered up but turns off after a few seconds. the user manual does not even show it on the drawing. I would like to know what it does and what position it shoud be in during normal operation.