SVP Model SS670 100 Watt Siren This Six-Function Siren Is Perfect For Law Enforcement Or Volunteer Firemen. It Is Designed To Run One 100 Watt Speaker With The Ability To Run For Extended Periods. Features: Radio Re-broadcast, Air Horn, Manual, Wail, Yelp and PHASER Modes, An On/Off Power Switch And Push Button For Manual Siren Or Air Horn, Horn Ring Override And Public Address. Measures: 6.5”L x 2”H x 6”W. *Choose Speaker (not included)