This auction features one piece of module boxes that convert your front or rear turn signals' standard flashing action to successive lighting. Each package includes 2 pieces 3-step sequential modules boxes, for both driver side and passenger side. With the successional flash module box installed, your car's turn signal lights get three sequential outputs with each flashing about 0.28 seconds for a full turn signal rotation of 0.85 secodns. This 3-step sequential chase flash module boxes are universal fits for most car's front or rear turn signal lights but needed some retrofitting work. Professional installing needed. If you want to installing it by yourself, please not that retrofitting actions such as wiring and wires extending are required. Input: 12V DC, OutputL 12V DC Supports up to 21W simultaneously colour:black Material:plastic Package Contents: 1 * pair Sequential Chase Flash Module Boxes Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.