... error light and sound problem Of vehicles(with can-bus system) like BMW,BENZ,AUDI,.......etc This 35W Can-bus ballast ... solve error light and sound problemOf vehicles(with can-bus system) like BMW & BENZ,AUDI,VW.......etc.Battery voltage : about 9V ... )Life : 2500 hrsDC-12V vehicle use HID ballast(Can-bus system)