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 Ideal for school administrators, homeowners, and facility managers seeking stable emergencies notification systems in crowded spaces like classrooms, warehouses, or retail complexes 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 Featuring a copper metal mixing housing and structure, it ensures long distance sound propagation with enhanced durability against impacts and harsh weather conditions, Manufacturer: JDNH