Small in size but big on power, the SS650 is ideal for volunteers and vehicles with limited mounting space. This unit is designed to operate one 100 watt speaker and features 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 in the Yelp mode. The SS650 features jumpers for option selections and is protected against speaker shorts with a self-resetting circuit and a high & low voltage shutdown feature. Ships complete with wire harness w/positive locking connector, mounting bracket, hardware, and instructions.