We just finished the installation of high-end Beltronics radar detection system in this SL550 Mercedes.
This is the controller unit tucked away in the center console.
The rear detector. This is will be hidden by the license plate once that is re-installed.
This is the forward detector, almost invisible behind the grill of the car.
This indicator LED is the only visible part of the install. It changes to red (and blinks) when it detects radar frequency bands.