Features: 1.Produces a powerful beeping sound that is 105 decibel, which has an excellent warning effect while reversing. 2.Helps to catch other driver's and pedestrian's attention even over great distances immediately, prevent accidents . 3.It can be protective when connect the wire inversely or wrong, which is safe and reliable to use. 4.The installation is simple and does not require complicated operations, save your time and effort. 5.Adopt premium quality metal and ABS material, high hardness, anti-corrosion and durable. Specification: Item Type: Reversing Horn_x000D_ Material: ABS + Metal_x000D_ Voltage: 12V/24V_x000D_ Power: 5W_x000D_ Current: 0.2-0.4A_x000D_ Caliber: Approx. 120mm/4.7in_x000D_ Sound Level: 105db_x000D_ Working temperature: -40-60_x000D_ Suitable for: 12V 24V universal_x000D_ _x000D_ _x000D_ How to Use:_x000D_ 1. Check the battery_x000D_ 2. Black wire is connected to the negative pole, red wire to the positive pole_x000D_ 3. Fix with screws_x000D_ 4. Ready to use PackageList: 1 x Reversing Horn