Only available on special order : This system is the standard 500 series siren, suitable for fire trucks and 4WD's. It has the standard LTS features, including the patented dual channel fail-safe circuit, broad frequency coverage in Wail mode and has excellent sound travel into side streets in Yelp mode. The siren is enclosed in a powder coated strong metal box, which can handle the toughest of conditions. The system is supplied with all mounting hardware including high quality low loss speaker leads as standard. Installation is simple and quick.