HID Xenon Complete KIT H4 6000k Hi/lo Dual Beam 813a 1.Intellective supervision,smooth lighting. 2.High low temperature and humidity environment endurance 3.shock-proof function can avoid the gleaming or going out on the bumpy road. 4.water resistance and inerference function are well ahead of the home-made level 5The ballast canProtection against over pressure 6The ballast can LOW volts protection,protect your battery. 7The ballast can No load protection,protect yourself. 8The ballast can Protection of opposite connection