·Operates a single 100/1150watt speaker. 
·Designed with new tone procedures. comprehensively improve warning effectiveness. 
·8 primary operating modes: Radio, Aux, Wail, Yelp, Pir, Air-horn override, User selectable tone and push-button mannul override 
·With exterior trigger function: when the siren is turned on. Wail, Yelp and Pir could be activated from steering wheel horn ring, convenient for driver to operate. 
·Polarity protection. 
·Double-color backlight indicator adapts night operation.
·Tones are ready to be customised. 
·With light control function 
·Warning sound volume adjustable.