This lamp is equipped with a built-in mini control module. The controller is embedded inside the light bar. Sealed inside the tube together with the lamp panel. Drive integrated ICs. Safe and strong against interference. Save installation space. The startup time is shorter. The program automatically recognizes the algorithm. Can achieve the same light when turning. There is an "L" "R" logo on the light board. L refers to the left turn. R means right turn. Easy to distinguish.