1) Applicable for the vehicles with two lamps, especially for the H4 series 2) Pleasant package, the control module is water-poof 3) Ceramic socket and corrugation bushing are equipped on this product 4) Applicable for both positive and negative poles 5) Needless to change original light wire system and bulbs 6) 12V and 24V 7) Many types from which you can choose to equip your car