Ideal for school administrators , homeowners , and facility managers seeking stable emergencies notification systems in crowded spaces like classrooms , warehouses , or retail complexes Featuring a copper metal mixing housing and structure , it ensures long distance sound propagation with enhanced durability against impacts and harsh weather conditions Engineered with erosion resistant ABS components and simplified mounting brackets , this alarm requires minimal maintenance while offering years of dependable service as a critical early warning device Equipped with a powerful 95dB alarm and rate waterproof design , this 6 inch electric alarm bells delivers penetrating emergencies alerts for both indoor / outdoor use , suitable for 6V 24V or 110V 220V power sources Operates flawlessly in corridors , industrial zones , parking lots , and outdoor areas exposed to rain / snow , providing defense against hazards across residential and commercial properties, Manufacturer: ERRORY