These halo rings are designed to create vibrant, bright white rings in your headlights that are sure to be noticed. Get the style of the 5 and 7 series but with much brighter rings! There are many competitors in the marketplace. Know that you are getting the best reliability of all halo ring manufcaturers when you order from Bimmian.com. All kits come with all necessary installation hardware, 4 rings, 2 ballasts, deluxe wiring harness, connectors, etc., and detailed installation instructions can be found online. To install, follow the provided instructions to open your headlight, the clips to attach the ring to your light housing, run the wires out the back, connect them to the ballasts using the provided connectors, plug the ballasts into the wiring harness and wire the relay to the electrical system. The rings will stay on when the car is on and stay lit for 10 seconds afterwards before turning off automatically. The electrical wiring is preassembled in heat a resistant wire harness and plug-and-play connectors for quick installation. Vehicle warranty problems should not arise from the installation of this product as it can be removed without any permanent electrical alterations, however, please verify this with your dealer before installation. The only time consuming and potentially intimidating (but not difficult) element of installation is the taking apart and reassembly of the light lens covers. If you are comfortable doing this then professional installation is unnecessary, as wiring is preassembled and wiring instructions are available online. The vast majority of kits are installed by their owners.