1Powerful Buzzer: Our siren can emit a powerful buzzer of 112dB (3dB). When you back up, no one will ignore this buzzer. 2 Materials: The alarm is made of materials to ensure durability and service life, and can work in various temperature environments. 3Easy to Install: The alarm is very easy to install, you only need to connect the wire from the positive screw terminal to the reversing light power cord or the reversing switch installed on the dashboard, and then connect the wire to the ground (negative). 4Dust Moisture Proof Alarm: The alarm enhances the sound and protects the speaker, which can prevent dust, humidity and all weather use. 5Application: This backup alarm is designed for 12?80 volt Dc vehicles and will automatically adjust to the voltage range of 12?80 volt vehicles, including trucks, cars, and Suv.