OPT7 2pc Bolt AC 35w Replacement HID Power Ballast for Xenon Conversion Kits AC digital logic technology keeps your lights clear and prevents flickering by adapting to the voltage of your vehicle. Quick and easy 30 min plug-n-play install with QuickSnap adapters. 100% Weatherproof stainless steel casing with grade 7 silicone sealant to ensure a long lasting unit.