i have lidatek le30 as well as sr7plus system..wrks great...i just took service guy from bmw for a drive tro show him a problem and it went off and then we saw the guy pointing at us, then on the way back the same guy had switched sides of the hwy and again he was aiming and shooting us and it went off and NOTHIn..no ticket....wrks great wrth EVERY pENNY