New and unused. *Please refrain from purchasing if you are not comfortable with home storage. *Regarding car audio, I am not an expert and cannot answer questions. Please use the photos to determine if it is compatible with your car. This is a Pioneer RCA harness for car audio. REMOTE CONTROLLER SIGNAL INPUT: For remote control signal input. SUBWOOFER: For subwoofer output. REAR MONITOR OUTPUT: For rear monitor video output. REAR OUTPUT: For rear speaker audio output. FRONT OUTPUT: For front speaker audio output. These cables are used in car audio systems to connect the head unit to devices such as amplifiers and monitors, and to transmit audio signals, video signals, and control signals.