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Video Sample on Youtube: https://youtu.be/7o0nhOis1mM Specifications: Material: Heavy-duty Plastic housing Waterproof: Yes Voltage: 12V-80V Power: 10W Current: 0.5A Dimension: Length: 3.9 in(including bracket) Width: 1.5 in Height: 2.57 in Loudness: 105 plus or minus 3dB,it will be louder in practical use. Features: Back-up alarm is made for heavy-duty & commercial use, best for Trucks Van Freight Car Lorry Heavy Vehicles Automatically adjusts to a voltage range of 12-80 volt vehicles,Waterproof housing with epoxy embedded electronics. Wiring is required to any 12V-80V DC power source. Preferably your reverse backup bulb wire Universal mounting bracket with slotted holes. It can be mounted anywhere in your heavy-duty vehicle. Easy to install. What's in the package? 1 X Backup Alarm