Most electronic devices utilize an electrical ballast to limit the amount of current in an electric circuit. So does the HID lights. If you want to install the HID lights， you also need ballast and you should consider this ballast . With latest technology， this HID ballast is excellent in stabilizing the current and preventing your car from damages caused by voltage drop. This HID ballast is easy to install and durable in use. With reasonable price and quality， this ballast is worthy of your ordering.                                    Features            (1.3X) brighter &amp; more consistent illumination of the road， and it can increase comfort and reduce fatigue when driving at night(35%) less power consumption， thus it generates less heat during operationCommon interface for all 35W AMP xenon bulbs                                                            Specifications            Input Voltage Range    DC 9V - 16V    <br>Input Voltage Rating    DC 12V    <br>A Light Output Load    HID 35W    <br>Output Power    35W - 2w    <br>Operating Temperature    -40℃~ +105℃ full range of input    <br>Body Size    8 x 7 x 3cm (thick)    <br>Weight    500g    <br>                                                            Package Includes            1 x 35W HID Xenon Thick Ballast Car Conversion Kit (General Type)