> They're not a theft deterrent, in fact they're generally hidden so a thief has no idea it's there. A potential car thief doesn't know if your car has an alar

> They're not a theft deterrent, in fact they're generally hidden so a thief has no idea it's there. A potential car thief doesn't know if your car has an alarm on it either, but he just assumes that it does because most do. With wide enough adoption of these devices, it could work out the same.