Model 450E electronic horn offers a loud, clear and distinctive tone. It's often used for general alarming, start and dismissal noticing, coded paging and process control in noisy areas. Its 4-wire terminal block and supervisory diodes design make it ideal for fire alarm applications. The 450E's polycarbonate housing and polymeric speaker are corrosion-resistant and weatherproof for improved durability in harsh industrial environments. It has no detectable RF emissions in a 30 MHz to 1000 MHz frequency range, which minimizes the potential for electrical device interference.