Give yourself a greater degree of blind spot coverage! The SenseStat„¢ Obstacle Detection Sensor System from Mobile Awareness reduces accidents while backing up. Perfect if you own a motorhome, camper, 5th wheel or travel trailer. Once in reverse the system automatically activates. LED display indicates distance within one inch (1€) of accuracy sending an audible 800Hz alarm and visual signals from the four (4) sensors mounted on your trailer to the dash mounted warning display unit in your tow vehicle. Mounts with 10 screws and two wires connected to the backing lights. Unique ECU learning function allows you to move the system from vehicle to vehicle seamlessly.