Description:With magnetic valve、 suitable for truck、 lorry、 train、 boat、 steamer etc (The truck/boat should have air source device)If your car is not include air source device、 you should install an air pumpComplete set air horn、 sounds safety and clearAir pump length: Approx. 11cm / 4.33 inchAir pump bottom diameter: Approx. 6cm / 2.36 inchAir pump top diameter: Approx. 4.6cm / 1.81 inchHorn mouth diameter: Approx. 8.6cm / 3.38 inchHorn length: Approx. 42.5cm / 17 inchVoltage: 24V/12VCurrent: 1.5ASound level: 120dbMaterial: Metal + PlasticsHorn color: SilverAir pump color: SilverPackage Includes:1 x Air horn1 x Air pump1 x Soft tube1 x bag of installed accessories