Features: Copper Wire,High Quality Connector with waterproof relay wiring harness. Make Your Car Lamp More Brighter. Super Power Boost This auto headlight booster it is special for H4 bulb car This relay wire harness will you full low and high beam functionality with its easy plug-and-play setup After install this headlight booster,you car bulb will more brighter 50%than before. Easy to install,no modification is needed,it is long usage life and more light output. 100% Plug & Play Wateproof and shockproof;excellent performance Excellent heat corrosion resistancetin widing copper wires This harness fixes: Dim Headlights Back Feeding Power Flickering Headlights Malfunctioning Headlights when using Hi/Low Beams Overloading the Headlight Switch Overheating Plugs Specifications: Function: Make Your Car Lamp More Brighter Model Number: H4 headlight wiring harness Voltage rated: DC 12V Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Contents: 1 Set x H4 Headlight Relay Wiring Harness