Acumen Cat 1.1 Alarm
Totally waterproof resin encapsulated electronics and waterproof Automotive-specification connectors rated to IP67 for ultimate reliability. Resists jet washing and water to a depth of 1 metre! Acumen are STILL the only alarm manufacturer to use waterproof connectors. You wouldn't dream of seeing a motorcycle manufacturer use non-waterproof connectors on the motorcycle Engine management system, so why accept non-waterproof connectors on an alarm/immobiliser system?
THREE sirens. yes, 3. One siren for what is probably the loudest Thatcham system, and two back-up sirens in case the primary siren is attacked. the Secondary, back-up, sirens are behind a metal plate for added security and also have their own driver circuit.