①. Equipped with a 95dB alarm and rate waterproof design, this 6 inch electric fire alarm bell delivers penetrating emergency alerts for both indoor and outdoor use, suitable for 6V, 24V, 110V, or 220V power sources. ②. Featuring a copper metal mixing housing and optimized structure, it ensures long-distance sound propagation with enhanced durability against impacts and harsh weather conditions. ③. Ideal for school administrators, homeowners, and facility managers seeking stable emergency notification systems in crowded spaces like classrooms, warehouses, or retail complexes. ④. Operates in corridors, industrial zones, parking lots, and outdoor areas exposed to rain or snow, providing defense against fire hazards across residential and commercial properties. ⑤. Engineered with erosion-resistant ABS components and simplified mounting brackets, this safety alarm requires minimal maintenance while offering years of service as a critical early warning device. ⑥. Specifications: Component: Copper, metal, ABS; Size: about 150x150mm/6x6inch; Power supply electric: 6V/12V/24V, 110V/220V optional; Sound: 95dB; Supply electric: multiple for option. ⑦. Package Includes: 1xSecurity Alarm. ⑧. note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.