The Brite Box Model 4L.DRL - Headlight enhancer - Keeps low beams ON with high beams. MAKES NIGHT DRIVING SAFER - your lights become high performance lights! For vehicles with Daytime Running Lights. Vehicle bulb data Keeps Low Beams ON with High Beams Makes Night Driving Safer! Works with Stock Headlights Plug and Play Installation Made in USA - 3 Year Warranty