Describe:Horn is suitable for all cars without air supply systemThere are 4 models to choose from (the fifth is a compressor, not a complete set of air horns, which is suitable for repair and replacement).IF your car is 12V ,please choose 12V air hornIt can produce sound as loud as 150DB. The great powerful sound catches everyone's attentionSpecification:Material: Zinc alloyVoltage: 12VProduct size : 45 cm x 10 cm x 9 cm / 17.7 * 3.9 * 3.6 inchesHose inner diameter :0.7cmPackage includes:1x Single Trumpet Air Horn

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