High Volume:It can produce 150dB of strong sound,When you drive, no one will ignore the sound,making driving more safer. High quality: The air horn is made of high quality chrome-zinc plating material, which ensures durability and service life and can work in various temperature environments. Easy to install: Our speaker suite is very easy to install, You can install it manually with the harness package we distribute. Suitable for any 12V vehicle type, including car,truck, SUV,RV,motorcycles off road Independent control: Button switch can control the speaker separately, so that you can choose to use the speaker or your original car horn in different driving environments. matters needing attention: one line of the button connects to the blue line (or white line) of our wiring harness, the other line of the button connects to the battery positive line, and the white line(or blue line) in the wiring harness connects to the frame. These are easy to connect wrong, resulting in the relay does not work.Please check it carefully! Item Dimensions :LxWxH 17.5 x 4.33 x 3.94 inches