COMPATIBLE WITH CHEVY GMC TRUCKS: Designed for 2003?2007 Chevy Silverado and GMC Sierra 1500/2500/3500 Classic. Works seamlessly with factory systems?no wiring mods required. ALL LIGHTS ON FUNCTION: Activates high beams, low beams, daytime running lights (DRLs), and fog lights simultaneously for maximum visibility during night driving. EASY 5-MINUTE INSTALLATION: Simply remove the relays (Fog LP, HDLP-Low, DRL, HDLP-Hi) from your fuse panel, insert the module, and reinstall the relays. No cutting, splicing, or special tools needed. OEM-STYLE PERFORMANCE: Maintains safe glare limits while boosting total front-end illumination. Perfect for drivers who want stronger, wider lighting coverage. DURABLE HEAT-RESISTANT MATERIALS: Made from rugged FR-4 PCB industrial-grade board for long-lasting performance under heat, vibration, and moisture exposure. Prevents overload while ensuring reliability. STEP-BY-STEP INSTALL GUIDE INCLUDED: Clear instructions make installation fast and foolproof?ideal for DIY upgrades. IMPROVES SAFETY VISIBILITY: Perfect for rural driving, dark roads, or foggy conditions where extra light makes all the difference.