The Becker Map Pilot is a modular GPS system for Mercedes-Benz cars and small SUVs. Please be sure to check that your car is compatible with this GPS system before purchasing. Simply plug the module into the harness in the glove compartment(in most cases) and press the navi button for full GPS with voice control, displayed right on your cars built in screen. The module comes with the original instructions, and the USB for computer updates to the maps.