HRP-ND 1.48 stitchs to control the ballast 2.bad rate : < 1‰ 3.performance better than HELLA 4.Protection of reverse connection: No damage against ballasts and bulbs will be caused by reverse connection. (In the extent of input) 5.Protection of short circuit: Lock protection against continuous or long-time short circuit. (In the extent of input) 6.Protection of open circuit: Recover when reboot. Lock protection in 0.5s after open circuit. Recover when reboot. (In the extent of input) 7.Special request: Water proof, shocking resistant Current Norm:3.4A