This 2pc Rebaydo HID High Beam Indicator Decoder Module pair is designed for 12V DC automotive systems to restore proper dashboard high beam indicator operation when HID headlamps are replaced with LED headlights. When converting from HID to LED, many vehicles lose the high beam indicator icon, and this decoder corrects that issue, allowing the indicator to function normally again. Commonly referred to as a HID high beam negative eliminator, each package includes two decoder modules compatible with H4 and 9003 applications. The modules install inline with the vehicle’s headlight wiring harness and require no modification to the headlight housing. Each unit features a durable ABS plastic housing with fully potted internal electronics for vibration resistance, moisture protection, and long service life in automotive environments. The overall length is approximately 4.12 inches, with the decoder module measuring about 1.0 inch by 1.0 inch by 1.0 inch. These modules are designed solely for high beam indicator correction, do not increase headlight brightness, and are not voltage converters. Each module is tested before shipment and built for long-term automotive use. CE and RoHS listed. H4/9003 Plug.