Just hope you don't live in California. If you have 4 or more jammer devices it is a misdemeanor. Doesn't even matter if its on. If a Cop see it they can tow your car and a hefty fine or even possable jail time if your a repeat offender. Those damn greedy politicians. Instead of fixing the ear marks, they make poeple pay for the stupid plans so they can get re-elected. And some how people keep voting for them. Sorry I went off on a little tagent.