Get the ultimate in protection for your vehicle! The two-stage RM-2000 radar motion sensor allows your alarm to detect the presence of an intruder before they even touch your car. The first stage detects the potential car thief as he approaches your vehicle, which allows you alarm to warn the criminal that you have state of the art vehicle protection. The second stage detects any motion in the interior of the car, which makes the RM-2000 perfect for convertibles or when you want to leave you windows down. Note: Beeper not included.