Here is a unique new product installed by us (Al & Ed's Autosound in West Hollywood, CA.) It works on the same principles as park distance sensors, but SMARTER! As you drive the front sensors communicate with the rear sensors. If you pass something that the front sensors detect first alongside your vehicle, nothing happens. If something comes from behind or sideways into your blind spot, the interior visual indicator will illuminate a solid amber color. If your blinker is on to change lanes before a car is in your blind spot, the interior indicator will flash the amber color until there is no threat detected. The system consists of the following : Two front bumper sensors (paintable so we can colormatch them to your vehicle) Two rear bumper sensors (paintable so we can colormatch them to your vehicle) Two LED interior indicators Here are pics after installation.