iDatalink s Maestro ADS-MRR module along with the correct interface harness for your vehicle allows you to install a new car stereo in select late-model Ford GM Chrysler or Volkswagen vehicles while retaining your factory steering wheel audio controls and the use of your factory amplifier if present. Here s how it works First you connect the Maestro to your Windows-based computer (not compatible with Mac) using the included USB cable visit www.idatalink.com/maestro and follow the instructions. Once the unit has been flashed it s ready to go. Next you ll either solder or crimp the vehicle-specific Maestro harness (sold separately) to your new receiver s wiring just like you would with any wiring harness or wiring adapter. Keeping your factory features with an iDatalink-ready car stereo If you re buying a compatible Kenwood or Pioneer receiver you ll enjoy the outstanding performance of your receiver plus seamless touchscreen control over most of the factory features in select GM Ford Chrysler or Volkswagen vehicles (see Details for specific functions and installation notes). Ford: You ll keep your SYNC system including the factory Bluetooth satellite radio (in select vehicles see Details) steering wheel audio controls and other great features. GM: You ll retain the use of OnStar® system along with your steering wheel audio controls your factory amp and safety warning chimes. Chrysler: You ll retain the use of the Uconnect® system (including voice command) along with your steering wheel audio controls and factory amp. Volkswagen: You ll retain your VW s Bluetooth the factory digital amplifier and fader plus VW s media device interface. Select Kenwood receivers allow you to display navigation info on your VW s multi-function screen. Important Note: You will also need an additional Maestro vehicle-specific wiring harness that connects your new receiver to the ADS-MRR module and your vehicle s wiring. We will automatically add this harness to your Cart at a discounted price when you purchase a new car stereo and this ADS-MRR module. Retain steering wheel audio controls too The ADS-MRR module also allows you to use your factory steering wheel audio controls with your new receiver. Using the intuitive web programming interface each factory button can be assigned a specific radio function. Better yet you can also assign a secondary press and hold radio function to each factory button effectively doubling what can be controlled. Product Highlights: allows installation of a new car stereo in select 2006-up Ford Chrysler GM and VW vehicles works with required vehicle-specific harness (sold separately) to retain factory steering wheel audio controls retain the factory amp if present and integrate all car stereo connections retains factory convenience features (OnStar SYNC Uconnect and more) with select Kenwood Alpine and Pioneer touchscreen receivers displays engine performance data on touchscreen with select Kenwood and Alpine navigation receivers dimensions: 4-1/8 W x 3/4 H x 2-7/8 D Whats Included: Radio replacement interface module 23 Eighteen-pin harness with bare wires on other end 23 Three-pin harness with bare wires on other end 18 Four-pin harness with a male 3.5mm connector/bare wire on other end 18 Four-pin serial port