Add peace of mind to your vehicle when backing up. Avoid dangerous situations and alert people around you that you are reversing. Product Description: This product can be installed on any vehicle with 12V to 24V DC system. Wiring will be required to the reverse bulb wire. Simple 2 wire connection. Produces output of up to 102 DB Universal warning tone at up to 102DB Note : The alarm sound is intermittent With Protection: Reverse polarity protected How to activation: Activation when reverse lights are on (must wire to them) High Quality: Stainless steel power and ground connection terminals, Waterproof housing with epoxy embedded electronics Quality Certified: Conforms to SAE J994 safety standards Size: About 4 inches (Width) x 3 inches (Height) x <2 inches (Depth) Package including: 1Pcs item just like the photo