Comparing with other brands' HID lamp kit, our new ballast is fashion & durable plated alnico case, small size and easy installation . Blue LED indicator is on the ballast, easy to check the operating status before installation . In order to make the HID lamp kit works perfectly, there is a hole on the surface of ballast which used to djust the current of output . Protection circuit is available; it will also protect the driver and computer system of the car when thunder happened Ultra thin Aluminum Die-casting ballast . Low voltage protection If the voltage is lower than 9V,the ballast will stop working automatically to avoid running out off battery ower . Over voltage protection If the voltage is over 16V,the ballast will stop working to prevent the bulbs burning up. . Open circuit protection against short circuit: In case open circuit happened due to short circuit ,the ballast will immediately cut off loop circuit to avoid electrical vibration or potential risk of gasoline tank exploded. Technical Data: . Working voltage: 9V~16V . Rated voltage: 13.5V . Max. Input current: 8A . Rated Current: 3.3A ?0.1 . Output power: 35W . Efficiency: ≤83% . Working temperature: -40oc~+105oc