Rebaydo 2pcs H4 P43t LED Headlight Bulb 5 to 9 Volts AC or DC. Non Polarity Dual Filament. Works either positive ground or negative ground vehicles.  These lamps are 1:1 plug and play lamps. They have the same clear cut-off line beam patterns as the original bulbs do, but much brighter and more compacted. Maximum voltage is 9 volts AC or DC. The lamps are made with 8-chips high power 3570 LED's. Uses approximately 1.47A@8V for both low beam and high beam. The real output reaches up to 1800 Lumens per headlight bulb. Up to 144 CP candle power per led bulb. Comparable to a 55 to 65 Watt incandescent bulb. These CSP led's are very close to the original filament size for the best conversion to led. The mini-inside fan runs very differently from the ones in the market. They are rare to fail! And even if by any chance the fan fails, the lamp will work the same. Classic vehicle and heavy truck lighting area. The headlight bulbs operate 5-9 volts. If your lights flicker or do not change from low beam to high beam after installation of the led headlights. When looking at the connector from the backside the left most contact is common usually positive ground or negative ground, the center contact is the low beam and the right most contact is the high beam. When the low beam is on there is a shade/cup to keep oncoming traffic from being dazzled or blinded. The led headlights will stay the same brightness form 5 to 9 volts positive ground or negative ground. Each bulb is tested before shipping. This product may require load equalizers to operate properly. One year warranty from date of purchase. Includes 2 bulbs per package.