With the ability to run at 200 watts for extended periods this siren sets the standard for emergency vehicle sirens. This siren features yelp, wail, radio repeat and standby modes. Depress the dual push- buttons for manual, phaser and air horn override. This siren's features each have separate volume controls for the radio repeat and public address functions with P.A. override on all modes. Siren panel is backlit for easy nighttime visibility. Siren measures 6.12"w x 2.14"h x 5.87"l; 9-16 volts; 700-1450 HZ Frequency. Meets Class A & GSA specifications. Ship. wt. 9 lbs.