... bulb types. Easy install with small spac AC Slim HID Ballast, 55W Slim HID Ballast, HID Xenon Ballast,HID digital ballast ... , Slim 55W ballasts. Technical parameter:Working Voltage: 9-16V, 9- ... protection: yesReverse polarity protection: yes Product Features:1. super slim shape with special digital circuit, flat transformer structure2.high reliability ...