Hi, I like to show you how to install h4 led headlight in car step by step in this letter.

At the first, we need to open the dust-cover back of auto lamps.

Then unlocking bayonet of original h4 halogen headlight.

And then install base of h4 led headlight in car and also lock the base tightly.

Then we need to turn our h4 led headlight in the base clockwise.

At the present, you need to turn on h4 led headlight in car and check if they are focus lighting.

If not, you need to adjust base slightly again until focus lighting coming.

At the last, you can close dust-cover of auto lamps.