just 4 LED's, I am surprised, I was thinking there would be more. Due to the 20 color part. Those LEDS go full 20 colors per each LED. This may explain the high price for only 8 LED's for under dash, a few for the cup holder and a switch.
I had the kit factory installed, however I have been looking to use the kit for my rear seats.. They seem to be about $220 online and they come with the 2 strips for under the dash, 2 leds for the cupholder, and the knob to turn them on/off and to change color... I'm assuming they give you the wiring to install it as well.
My 20 led light kit was already installed when I brought the car. It has an on/off push button switch on the floor near the cub holder. My grandson loves playing with the different colors, but otherwise I leave them on blue, since it's a calm color for night driving.