Warning horn mainly used for cars, excavators, construction machinery, special vehicles, parking lots and a variety of large vehicle container transport vehicles. Nylon alarming horn , very sturdy and durable. All DC12-80V vehicles universal. Loud Sound-Volume: 105db car reversing horn. The truck backup alarm can emit a loud 105 decibel beep; it will be more powerful in practice. Very practical and easy to install. It can automatically adapt to a voltage range of vehicles from 12 to 80 volts. With its universal mounting bracket and slotted holes, it can be mounted anywhere in your heavy duty vehicle. High security performance. This can be protective in case of reversed or wrong wire connection. Product Description Description: This emergency warning buzzer alarm of 105 DB is designed for heavy-duty and commercial use, ideal for truck freight trucks. It can automatically adjust to a voltage range of vehicles from 12 to 80 volts. With universal mounting bracket and slotted holes, it can be mounted anywhere in your heavy vehicle, very convenient and easy to install, so it's mainly used for cars, excavators, construction machinery, vehicles special, parking and a variety of containers of large vehicle recall vehicles. Features: 1. Made of nylon, very sturdy and durable. 2. All DC12-80V vehicles universal. 3. It can be protective when you connect the wire reversely or incorrectly. 4. Produces a loud beep of 105 decibels, it will be louder in practical use. 5. Universal mounting bracket with oblong holes. It can be mounted in several places in your vehicle.