the range on mine is about 100 yards through walls and other barricades. i can get about twice that with line of sight.

having windows tinted is good, but it attracts attention too. including the cop's attention if you have really dark tint. legal limit is 35% transmission in mass, i have 12%...i've yet to be cited for it though. just don't do something that gives them a reason to harass you. (riiiiiight...like that works )