The SS670 is a full feature 100 Watt compact siren. Rotary switch selectable operating modes and separate volume control for the radio repeat and public address functions. This unit also includes an attached noise canceling PA microphone and is backlit for easy night time readability. Wail, Yelp, Air Horn, Phaser, Manual, and Two Tone Meets Class A Specifications Self resetting Circuit Protection against speaker shorts Integrated public address microphone Park Kill Auxiliary Input Wiring harness included Locking connector on wiring harness Replaceable jumpers for option selection Positive and negative switching for AUX and PKILL inputs High and Low Voltage Shutdown Protection Drives one 100W speaker Dimensions & Weight: Size: 6" Wide x 6-1/2" Deep x 2" High Boxed Weight: 5 lbs.