1、Chrome Metal: The truck horn is made from metal and chrome plated to ensure stability, reliability, and can withstand long periods of use and high frequency of operation in a variety of environmental condition. 2、Powerful Sound: Train horns can be as loud as 150 decibels or more. The 4 different sizes of stainless steel horns emit an loud warning that can be heard for miles. With a sound this strong, it's the most effective and safest way to alert others to your presence. 3、Effortless Installation: This truck horn is designed for simplicity in installation, allowing users to hook it up to the basic car electrical system. Plus, its easy removal feature offers the convenience of effortlessly switching it from one vehicle to another. 4、Wide Operating Range: The horn operates effectively within a range of 70 PSI to over 140 PSI. This range ensures that it consistently functions at optimal capacity, regardless of the pressure conditions. 5、Broad Applicability: This air horn is suitable for a variety of vehicles. It can be used in 12V/24V Car Trucks, Boats, Lorries, and virtually all other types of automobiles.