PAC ROEM-GM21A System Interface Kit to Replace Factory Radio and Integrate Factory Amplifiers for Select 99-02 full size GM/Chevrolet SUVs Designed To Replace The Factory Radio And Keep The Sound Quality To Its Full Potential Allows clean audio quality Plug and play System interface to replace factory installed receivers and integrate factory amplifiers Adjustable 4-channel RCA outputs that provide Line Level Matching Isolated transformer inputs and outputs Trigger wire included For select GM/Chevrolet vehicles