9006 9005 LED DRL anti-flickering harness are used for fixing LED DRL(daytime running lights) bulbs flickering when you upgrade your stock halogen high beam/DRL to LED, the vehicle produce pulse current to DRL line, yet LED is one direction current drawing, which will cause the flickering.
This kits usually are compatible with vehicles 2010 Up Japanese vehicles like up 2010 Toyota, Lexus, Honda, Hyundai, etc.
Fore most vehicles, LED bulbs just plug and play, easy installation. For some European vehicles, extra LED resistors or decoders or DRL anti-flickering harness maybe required to avoid the flickering or error code.