Features: A. Fit for A6 C6 C7. 2012-2021 model. * The blind spot radar detector assistant system including both side glass+24ghz radar system * Radar: 24ghz millimeter wave * Voltage : DC12v from car ACC * Detect range: 0-15M * It is an alone system, not to connect the car system. *When someone nearby your car 0-10 meter, and faster them your car, the radar could detect it, and them the led will flash to warning you. If at the same time you are going to lane change, and the turn signal lights working, the led and the buzzer will warning you together. Easy to install * Fix the radar sensor to the back of the car after remove the rear bumper. * Replace the original car side mirror, connect the led wire to the radar system. * Connect the wire near by the glass to the indicator light positive electrode for control the buzzer work. * Connect the power wire to the car ACC positive electrode. and connect negative electrode to the battery negative electrode.