Durable Construction: The 4x6 led headlights shell is constructed with a die-cast aluminum housing and UV-protected PC lens that resists cracking and yellowing. The rapid cooling design of the aluminum alloy fins can effectively extend the life of the light to more than 50,000 hours. More Complete Performance: DOT SAE Approved rectangular LED headlight, makes your vehicle legal on the road. H4651 Led headlight with IP68 waterproof rate and it will still work and very bright in extreme weather conditions. Ultra Bright Output: The 4x6 headlights uses the high-intensity LED chips to make sure maximum light output with 300% brighter and better visibility than stock headlamps to improve visibility on the road. Full Functions: New upgrade H4656 LED headlight, comes with all the functions you need, including high/low beam, white daylight and amber turn signal lights. The anti-flicker is integrated with circuit board, perfectly avoid flickering. Wide Compatibility: Our versatile 2a1 led headlight are compatible with a wide variety of vehicles, is replacement for H4651 H4652 H4656 H4666 H6545 stock headlamp. Compatible for Kenworth Peterbilt 357 378 379 headlights and other vehicles with 4x6 led headlights 4pcs housing. Ultra bright 4x6 led headlights fit for peterbilt 379. It also compatible with any other vehicle with H4651 halogen headlights. The peterbilt 379 headlights feature with white halo daylight and amber turn signal function. it is a full function H4651 headlights that meet all your needs. Excellent beam pattern with clear cut-off line. DOT approved 4X6 led headlights ensure you drive safely on road.