Get the ultimate protection for your investment. The BMWRS offers a fully adjustable dual stage system, allowing you to fully customize the sensitivity and range of your sensor. When the radar sensor detects motion near your vehicle it will beep, warning away intruders.(stage 1) If the intruder enters any part of the interior in any way, the sensor will set off the alarm.(stage 2) Perfect for all BMW convertibles including Z3s and 325ics. The BMW-RS is made in the USA and features a limited LIFETIME WARRANTY.