FEATURES: Wide Application- The 530 Back-Up Alarm can be automatically adjusted to range of 12-48VDC. Make it compatible with a variety of vehicles and systems, including trucks, construction machinery, forklifts, and buses Audible Warning- The alarm up to 105 dB, provides an audible warning to pedestrians and nearby personnel when a vehicle or machinery is reversing. Be louder in actual use, and easily remind pedestrians to pay attention .
eBay