OEM-1 with a vehicle specific harness plugs into the vehicle"s wiring and provides a stereo RCA audio output for adding aftermarket amplification. Provides full range audio output 20-20,000Hz. Audio output level is controlled by the volume of the factory radio. OEM-1 with a vehicle specific harness plugs into the vehicle"s wiring and provides a stereo RCA audio output for adding aftermarket amplification. Provides full range audio output 20-20,000Hz. Audio output level is controlled by the volume of the factory radio.Product FeaturesPlug in installation retains factory wiring integrityLinear 20-20,000Hz sound reproduction based on input signal4 channel RCA outputOutput level controlled by factory radioCompatibility NotesNot compatible with premium factory amplified systemsWarning chimes will sound through the front left RCA output