Signal Vehice Products Full Feature 100 200 Watt Siren with the ability to run at 200 Watts for extended periods, the SS700 sets the standard for emergency vehicle sirens. Rotary switch selectable operating modes include Phaser, Yelp, Wail, Hands Free, Manual, Alert, and Radio. This siren features separate volume controls for the radio repeat and public address functions. Also included are public address override, park/kill option, and speaker diagnostics. The siren is backlit for easy night time readability. Size: 6"L x 6-1/2"W x 2-1/2"H, Weight: 6 lbs.