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 * 5、The ballast canProtection against over pressure 6、The ballast can LOW volts protection,protect your battery. * 7、The ballast can No load protection,protect yourself. 8、The ballast can Protection of opposite connection