This picture is mine, but published by @tkaiser http://linux-sunxi.org/File:Beelink_X2_3.1.1_RTL8189ES.jpg
Is a pogo pin or sprig loaded, not a switch, it can be used to connect with a flat antenna in the cover of the box like the showed in the picture from this link: http://dreamlayers.blogspot.com.es/2014/11/craig-cvd601-android-stick.html