The SS650 combines small size with big power. This unit is ideal for volunteers and vehicles with limited mounting space. The SS650 is designed to operate one 100 watt speaker and feature a 3-position rocker switch that gives you Yelp and Wail tones while offering Manual siren control and Air Horn override in the Standby mode. The momentary rocker switch provides Phaser override and Yelp mode. Te SS650 features jumpers for option selections and is protected against speaker shorts with self-resetting circuit and high and low voltage shutdown feature. 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.