It was plug and play for me. What is your vehicle?
EDIT: Sorry I see it now (I was on my phone). The promise is to work as plug and play and I don't know it otherwise.
I mean, in order to swap the headlights, you have to take the bumper off, at least the top portion. loosen bolts on the old one and take it out and put this instead and bolt back. It is an okay process.
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