Plug & Play x2 H4 Type Polarity Correction Module Connector with Wiring for 7x6 H6054 HID or LED HeadlightFeatures If you have 80s, 90s Cars and Trucks that uses H6054 7x6 Sealed Beam originally and you find out when upgrading to the newer LED Headlight, the LED headlight is either missing low beam or high beam or not turn on at all or just overall not functioning properly, you will need these modules. Simple inexpensive solution as the module will correct the polarity itself since LED is polarity sensitive so LED headlight will finally function properly