This wiring kit is designed to illuminate the inner (back door side) lamps, which normally do not light up during braking. This 4-lamp modification improves visibility for following vehicles. It also allows you to differentiate your vehicle from a standard model. The wiring uses dedicated connectors for easy, plug-and-play installation. 【Important Notes Regarding Full Brake Light Illumination】 This product is a wiring kit that illuminates the inner lamps (small lamps), which normally do not light up during braking. During the day, it is designed to illuminate both the outer and inner small lamps, resulting in 4 brake lights when braking. At night, the inner lamps are constantly illuminated as small lamps, so only the outer brake lamps will light up during braking, resulting in the same illumination as a standard vehicle. The inner lamps only have small lamp bulbs installed, so they will not be very bright. 【Compatible Vehicles】Vellfire 40 Series. Note: Compatibility with Alphard has not been confirmed.