Waterproof truck backup alarm for excavator, 112dB loud buzzer YC-317C1、Easy Installation: Connect the wire of the positive terminal screw to the power line of the reverse light or the reverse switch installed on the dashboard, then connect the wire to the ground wire (negative terminal). The backup warning alarm provides guard in case of reversed or wrongly connected wires. 2、Sturdy Construction: Built with premium ABS material and water resistant shell, this backup alarm ensures high reliability and unmatched durability in various temperature environments, resistant to fade, scratch, impact and oxidation. 3、Versatile Use: The reverse beeper alarm is suitable for 12V to 48V heavy duty vehicles and commercial purposes, or trucks, cars, excavators, construction machinery, special vehicles, parking lots, and various large container vehicles. 4、Powerful Warning Sound: Emitting a 112dB strong beep, this alarm ensures that no one ignores the alert when you reverse, immediately drawing attention of other drivers and pedestrians to prevent accidents from happening. 5、Enhanced Safety: The backup reverse alarm provides a distinct and audible warning, reducing risks associated with blind spots and poor visibility in reverse, enhancing overall safety on the road.