Blind Spot Monitoring gives an audible tone and visual warning light to alert driver when vehicle is in blind spot and turn signal is activated. Detection range of approximately 40ft behind vehicle/ Built-in rear cross-traffic alert senses vehicles approaching from the sides (helpful when backing out of a parking spot). System ignores stationary objects – minimizing false warnings. Accurately monitors the lane next to the vehicle without triggering warnings for vehicles two lanes over. Senses everything in size from motorcycles to semi trucks. 3 year/36,000 mile warranty