This kind of car horn is universal for 12.0V and 24V car. It has loud sound, waterproof, dustproof, tensile resistance, long service life, corrosion resistance and nice performance. Specifications: Material: plastics; aluminium alloy Color (optional): red (plastics), silver (aluminium alloy) Item size: Red: 235 * 80 * 80mm / 9.3 * 3.1 * 3.1in Silver: 250 * 85 * 85mm / 9.8 * 3.3 * 3.3in Item weight: Red: 278g / 9.8ounce Silver: 395g / 0.9lb Package size: Red: 243 * 80 * 80mm / 9.6 * 3.1 * 3.1in Silver: 260 * 95 * 90mm / 10.2 * 3.7 * 3.5in Package weight: Red: 345g / 0.8lb Silver: 470g / 1.0lb Note: Due to different installation positions, the number of screw accessories of red horn and silver horn is different. Package List: 1 * Horn 1 * Screw Accessories.