allows installation of a new car stereo in select 2006-up vehicles built by Chrysler, Fiat, Ford, GM, Honda/Acura, Subaru, Toyota/Scion, and Volkswagen the module will need to be loaded with correct firmware before installation — see Details for more information 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 iDatalink-ready receivers displays engine performance data on touchscreen with select iDatalink-ready receivers setup via Bluetooth-enabled device or mini-USB-to-USB-A cable three programmable outputs control relay-driven aftermarket accessories dedicated port connects to select Escort radar detectors (sold separately) dimensions: 4-3/4"W x 3/4"H x 3-1/4"D