The rotating base, fixed bracket, follow-up connecting rod and swing arm are finished by CNC engraving aluminum alloy process, surface frosting and anodized coloring. Equipped with steering gear stainless steel cover, a 9G size steering gear needs to be selected, and the Y line is connected in parallel to the steering channel to realize the steering follow-up function. The steering gear is independently inserted into the receiver channel to realize the function of independently controlling the left and right visits of the roof lights.