4pc. Wireless control Multi-Color Auto change Various color LED Interior Underdash Lighting Kit, Add Sound Activation Function Wireless control every light bar auto change various color (Red-&gt;Blue-&gt;Green-&gt;white etc.) Very easy to use include 12V Fused Replacement Cigarette Lighter Plug Multiple Patterns: Flash, Sport, Fade and Smooth Effects. Very easy to control the LED brightness on the controler. The sound activation mode allows the LED interior lights to react to the music playing.