Depends what box you have, the kapsch unit( normally blue, normally 12v cig lighter type) which does france, spain, portugal also does belgium. It is pretty much unlit and its pretty much the size of a go-box.
If you have a satellic box, i taped it over last time i drove a truck with one in. Why people have them is beyond me, specially when the kapsch one is over half the size and does 4 countries.