Fitment: fits for 2003-2007 Chevy Silverado GMC Sierra 1500/2500/3500 Classic
Easy to Install: No modification for existing wiring.Just find your fuse box,pull out 4 relays labeled Fog Lp, Hdlp-Low,Hdlp-Hi, Drl.Lay down the circuit board and reinstall those relays back into original location.
Package includes: 1 x circuit board; No instructions included, professional installation is highly recommended.
30 days free return from the day you order if you are not satisfied with our products.