100W AC Xenon HID Ballast H1 H3 H7 H10 H11 H13 H4 9004 9005 9006 9007 Conversion Replacement (Pack of 2) This HID Xenon Ballast can protect low/less or over voltage, anti-electromagnetism, connection circuit. SMR Ultrafine electronic memory chips: stabilize voltage and energy conversion to protect HID function Unique aluminum heat sink housing design keep the ballast working under low temperature, avoid damaging plastic parts around HID produces supreme light output, Great visibility and Safety for driver Waterproof, Heatproof, Shockproof, Anti-Electronic Interference and Constant Power Output