H4 p43t led headlight forward firing. Operates either positive ground or negative ground. Works with wide range of voltage from 6 to 30 volts. The bulb has full brightness from 5.7 volts to 30 volts for both the low beam or the high beam. The bulb is dual filament has both a low beam and a high beam. The bulb uses a focused beam that is forward firing so you do not have to use your old reflector. Available in White 6000K or Warm White 3000K. If the color attribute is not shown it means that we are out of stock of that color and takes 4 to 8 weeks to restock that color. The bulb comes with a Alan wrench to you can adjust the focused beam due to how your fixture socket is orientated. The led bulbs do not have built in load equalizers and may require external load equalizers. Symptoms are either the headlight bulb will flicker or unable to change from low beam to high beam.