When replacing your factory radio with an after-market car stereo, the Metra 70-7553 wire harness is a must for a quick and clean installation. It eliminates cutting your OE radio plug. After connecting it, your install is simple as the wires will color-match and easily connect to the after-market stereo. Without the Metra 70-7553, you would have to cut the OE radio plug and manually test each wire to connect to your after-market receiver. In addition, because you do not have to cut your OE radio plug off, the 70-7553 allows you to reinstall your factory receiver if necessary. A great example is if you sold your car, but wanted to keep your after-market radio and re-install your factory stereo receiver. Amplifier Integration Harness Designed for Select Nissan Vehicles with a factory amplifier Compatible with premium sound system Have RCA connections for amplifier integration Radio must have at least a 4V preamp output For use in 2007 and up Nissan vehicles with premium audio INTO CAR. Compatible with premium sound system have RCA connections for amplifier integration radio must have at least a 4V preamp output for use in 2007 and up Nissan vehicles with premium audio HARNESS.