Train horn kit for trucks 12V 135dB with 4 trumpet air horns1、Sturdy Metal: The horn set is made of strong metal and chrome plating, ensuring long term stability and reliability. Designed for various environments, it can withstand long term use and high frequency operations. 2、Loud Warning System: The train horns can reach 135 decibels, emitting loud warnings that can be heard miles away. This strong sound is the most effective and safest way to alert others of your presence. 3、150PSI 3L Air Compressor: Equipped with a 3L 0.8 gallon air compressor, it has an automatic safety protection design that stops pumping when the internal pressure reaches 150PSI. It also includes 4 shock absorbers and a 30 amp fuse under the mounting leg to prevent accidents effectively. 4、Easy Installation: The air horn kit can be easily connected to a basic car electrical system, allowing for effortless transfer from one vehicle to another. This makes it easy for you to install and operate on your own. 5、Compact and Versatile: The air compressor horn kit is compact and suitable for most vehicles, such as cars, boats, trucks, tractors, and more. It is ideal for large vehicles in busy traffic or emergency situations.