About this item [Wide range of applications] All vehicles DC12-80V universal. This 105 DB emergency horn is mainly used for cars, excavators, construction machinery, special vehicles, parking lots and other container transport vehicles. It can automatically adjust to a vehicle voltage range of 12 to 80 volts. [Easy Installation] With its universal mounting bracket and slotted holes, it can be mounted anywhere in your car. your car, your heavy vehicle, very convenient and easy to install. [Loud Voice] Produces a loud beep of 105 decibels; it will be stronger in practice. It can be protective when you connect the cable upside down or wrongly. [Safety Material] Made of nylon, very strong and durable. Nylon has superior mechanical strength, high softening point, heat resistance, low coefficient of friction, abrasion resistance, self-lubricating properties, shock absorption and acoustic properties, resistance to oil and resistance to self-extinguishing, odorless and weathering.