You get the DRL's and all of the cabling you need. The cabling that goes through your firewall is already in place on all models, so connecting the DRL's on the exterior of the car is as straightforward as removing a cap from the already-in-place wiring harness and plugging in the cabling that comes in the kit.
HOWEVER, actually putting the DRL's in place and routing the new wiring harness requires removing the front bumper entirely. More difficult is connecting the DRL's to your main computer inside the cabin - you will need to completely rip out your entire dash to be able to do it. You will then also need to flash your computer to actually enable the DRL functionality.
So, the kit comes with everything you need except for the tools to completely disassemble your vehicle, flash your computer via the OBDII port, and maybe some IcyHot for your soon-to-be-sore body.