Description:Name: H4 Automotive Headlamp EnhancerType: 12V car H4 headlight relay harne, 1 to 2Explanation: The H4 automotive dedicated headlight dimmer mainly increases the brightne of the light, prolongs the service life of the light bulb, improves the safety of nighttime driving, and protects the circuit and related electrical appliances.Easy installation: suitable for 12V H4 bulb modelsEasy to install: Changing the 100/90W light bulb no longer requires careful damage to the original vehicle wiring. It is powered independently to protect the original vehicle wiringAembly Method:1. Before aembly, check whether the working voltage of the vehicle model is 12 volts; This product cannot be installed or used with a voltage of 24 volts2. Connect the red wire of the brightener power directly to the positive pole of the battery, then unplug the two headlight sockets. Connect one end of the original car to the brightener socket, and leave the other end emptyPrecautions:The brightener has little impact on the lifespan of the light bulb. If there is a quality iue, it can be caused by the following situations:1. The original car's light bulb has been used to its limit2. The generator voltage is too high3. The quality of the light bulb is poor, it is recommended to use genuine factory bulbsPacking list:1 set x H4 Car Headlight BrightenerNote:1. Due to manual measurement, please allow 1-3cm error. Make sure you don't mind before bidding.2. Due to the difference of different monitors, the picture may not reflect the actual color of the product. Thanks.