Note: It is not a plug and play plug. No ballast required. Note: When installing this LED headlight. Do not connect its plug to the socket of the original HID bulb. If you encounter installation problems, please contact us first. Compatible with D2S D4S D2R D4R D2H D2C D1S D3S D1R D3R D1C D3C D4C D8S. This light does not require a ballast. It is not need connected to the ballast. When installing it you need to bypa the ballast and connect its plug directly to the 12V power socket behind the ballast. The perfect replacement for HID/xenon lamps. Package Included: 2LED headlight bulb High Brightne. Instant start in 0.1 seconds. Powerful 3570 Big LED Chips. HID takes 10 seconds to be normal, and our LED only takes 0.1 seconds. Lights type standard, safe driving. NOTE: High and low beam switching depends on the control of the baffle inside the projector, not on the LED headlights. Baffle up - low beam mode, Baffle down - high beam mode. CANbus-ready. Error-free Innovative smart drive. Since there are thousands of ballasts, the plug-and-play LED bulb power driver cannot be 100% compatible with these ballasts, which leads to the following problems after installing the plug-and-play LED bulb: the bulb does not work; flickers ; Error On the dashboard and other abnormal conditions, so our this LED bulb that does not require a ballast is the best product to solve these problems. Long Service Life. 50,000 hours. Quadruple cooling technology. Pure copper substrate, heat transfer faster. Aviation aluminum body, overall heat diipation. Intelligent temperature control driver. High-speed turbocharged fan diipate heat quickly. The service life is over 50,000 hours. Protective Design. IP68 level. Waterproof. Dustproof. Cold proof. High temperature resistance. IP68 protection level. There will be no problems in all kinds of bad weather. Satisfactory Service. 100% satisfaction target.