... 3 stage Bi,Bi reminder CE,E-marknew LED display parking sensor system LX-10011. 3.00M high power transmitting, 0.2m ... notifies the driver of the distance and position of obstacles. 4. Three stages indicating, the closer the obstacle, the faster ... the beeping frequency.5.Detecting distance range from6. 2/4/6 sensors optional7. Insert/stick/waterproof sensors optional.StagesDistanceDisplaySound ...