Safety CompliantUniversal Car Truck Backup Horn Warning Alarm, Each Backup Horn Meets Sae J994 Safety Standards, Reversing Horn Protected Against Reverse Polarity And Activation When Reversing Lights Are On.High SensitivityThe Universal 12V 105Db Car Alarm Horn Adopts High Sensitivity To Improve Safety When Reversing. Helps To Increase The Safety Of Passersby, Pedestrians And Family Members Who Are Near The Moving Vehicle. Reverse Safety. Emergency Horn Output Up To 102 Db, Vehicle Dc System Voltage Plae 12 Volts, Power 5W, Current 1.5A. You Can Use The Reverse Car Reversing Horn, Car Buzzer To Alarm With Perfect Performance.High Quality MaterialsReverse Buzzer, Reverse Backup Buzzer Adopts Premium Abs Material, Which Is Reliable And Durable. Sound: Beep Beep Beep. And The Car Alarm Sound Comes With A Fixed Bracket, Easy To Install And Use.Loud Alarm SoundCar Reverse Warning AlarmUses Voice Coil And Diaphragm Material High Quality, Loud Alarm Sound. And We Have A Professional After-Sales Team To Answer Your Questions Within 24 Hours.