Can also have External Horn ( 108db ) using HSP15 & External Strobe attached ( see items below )
Higher outputs are possible depending on model of external speaker. Up to 115db
Note; This Unit CAN operate from 12 Volt DC Battery / Solar Systems ( Call for Details )
See Demonstration at this web address;
http://www.youtube.com/watch?v=JocoQ7AXMqg