This radar based blind spot kit from Brandmotion is activated once the car surpasses 15 miles per hour. The radar sensors reduce false alarms by 85 percent and allows drivers to back out of crowded parking lots and change lanes on the highway without worrying about blind spots. The radar relies on CAN data in order to receive accurate car speeds and the system as a whole has a real OEM feel that fits perfectly in 2007 models and beyond. This Brandmotion system is also equipped with both audio and visual alerts that work once the turn signal is activated. In terms of detection range, the new and improved RDBS-1500 detects vehicles that are 40 feet away. This detection range applies to the rear of the car.