The Napa Echlin HR112 is a vintage 12V multicolor horn relay designed for AMC Rebel, Marlin, Dodge Polara, D100, and S500 vehicles. It is a switch assembly with dustproof and weatherproof features, making it durable for long-lasting use. This NOS (New Old Stock) part is made in the United States and is not a universal fitment, specifically designed for front placement on the mentioned vehicle models. It is a genuine NAPA product with various interchange and OE/OEM part numbers for compatibility and reliable performance.