Easy installation and reliable， convenient for security drivingLong life and reliabilityDiameter: Approx. 9 cm / 3.54 inchHorn mouth size: Approx. 7.8 x 5.7 cm / 3.1 x 2.2 inchFrequency: 410HZ (low frequency)， 510HZ (high frequency)Sound Level: 120dB/110dBPower Supply: DC 12VHorn color: Red/Carbon Fiber ColorMaterial: Metal + PlasticsFitment: Universal For Car/Truck/Van/Boat/Motorcycle etc.Installation instructions:Horn mouth should be installed with downwards (or 45-degree angle)， in case the water flow into hornIf you are laypeople， it is not allow adjusting the angle of bracketInstall range of horn bracket is within 6Nm-11NmThe horn and brackets should be installed on a solid surfaceIt is better to install on well ventilated position， the horn is only connect with bracket， avoid to touching with other partsThis product install without any require about pole， connection of wire should be reliable， dual-tone horn should be install on a solid surface by parallel connectionThe install of horn should be far away from engine and other euthermic positionWorking of electrically horn in rated short-time， uninterrupted sound is not allow more than 60S in each time， otherwise， lead to coil would be brokenPackage Included:2 x snail horns2 x brackets2 x nuts