PAC ROEM-CHR System Interface Kit (Replace Factory Radio and Integrate Factory Amplifiers for Select Chrysler Vehicles) Plug in installation retains factory wiring integrity^Transformer isolated for optimal sound and performance^Maintains correct phasing^Retains the function of the factory-installed amplified sound system System interface to replace factory installed receivers and integrate factory amplifiers Adjustable 4-channel RCA outputs Isolated transformer inputs and outputs For Chrysler and dodge vehicles with factory installed infinity sound system Not all Chryslers with an infinity sound systems need an interface. When using this interface, if the sound is low but balances and fades correctly, you do not need this interface