I have come to know that if anyone (specially foreigners)is caught with this device, his drivers license will be canceled, his car will be ceased, and sometimes deported from KSA. But still I am speeding all the time, the max is that if I am caught by police or any camera, I will pay the penalty (around SR.300), still this is a cheaper stake for speeding thirst. Besides all these, the drivers coming from the other side are also helpful in KSA as they give a fast high and low beam to warn you that police is ahead, thats a clue to lower for us to lower the speed, and I have experienced it many times, 90% of this type of warning proves to be true, as right after getting such hints and helps from our fellow Saudis I have encountered cops and check posts.
Anyways, Keep speeding guys !!!