It widely used for police car, ambulance, fire truck, trailer, wrecker, road construction crews, dot workers and so on. Size can be 1M, 1.2M,1.4M and 1.6M, can be allocated with loudspeaker 100W.If selecting LED, the alarm can be allocated inside the lamp, and there is only a handle type controller inside the car to complete all operations. Emergency Warning Light with 12V/24V Voltage