Haven't had my two for long, they have the most sensitivity to rearward radar of any of my other detectors.Don't know if the scrambler part will work, a speed trailer still picked me up, but could be the signal was so strong i was in the "punch through" zone. Passed four cop cars/cycles in about four blocks yesterday. The city has a 6 million shortfall right now. Don't want to be a source of their recovery. Incidently, it was thirty degrees with two cops on motorcycles.