Feature: 1. Suitable for vehicles with a compressed air brake system. 2. This horn guarantees the attention needed in critical situations as they add a level of safety to your driving with 135db of sound. 3. Made of fine quality metal inside and ABS surface coated in black color for a long lasting finish. 4. Fine contact and simple to install. 5. Loud and clear sound. 6. Low power consumption and fine performance. Specification: This horn is made of fine-quality ABS plastics, which make it more practical. A perfect horn with beautiful appearance, which is also loud. Features: Suitable for vehicles with a compressed air brake system. This horn guarantees the attention needed in critical situations as they add a level of safety to your driving with 135db of sound. Made of fine quality metal inside and ABS surface coated in black color for a long lasting finish. Fine contact and simple to install. Loud and clear sound. Low power consumption and fine performance. Specifications: Material: ABS and Metal Color: Black Voltage: 12V/24V Volume level: 135DB Operation Air: 0.5Mpa-0.8Mpa Current: 4.0A Size: 210 * 160 * 110mm / 8.3 * 6.3 * 4.3in Weight: 700g / 1.54lb Package size: 250 * 180 * 150mm / 9.8 * 7.1 * 5.9in Package weight: 800g / 1.76lb Packing List: 1 * Truck Air Horn Package List: 1 * Truck Air Horn