It does come equipped with wiring, however I was advised to purchase one that would connect better with my vehicle. Best Buy is able to check the specs of your vehicle and get you the wiring harness that would create a better fit and sound. I notice some people mentioned how the volume or tone doesn't work well and the techs at Best Buy explained this would be the reason for wanting to purchase a wiring harness specific to my vehicle. The wiring harness for my Jeep Wrangler was about $20 - not bad and the sound is awesome. I hope this helps.