I been using the laser jammer for the last 9 months, I believe it works but you have to understand its limitation. It only buy you an extra 5 seconds or so before the good up to date laser gun is able to pickup you speed. I use it with V1 and it is a great combo. Ps: I think it works even better when you have your headlights turn on! It slows down the laser speed detector to pickup your speed.