①. This 8 inch stainless steel spark alarm bell delivers high decibel alerts with outstanding penetration, ensuring immediate attention in noisy environments while meeting strict safety standards for flammable areas. ②. Crafted from erosion resistant stainless steel and ABS, its wall mounted design features a unique structure for obstacle piercing sound waves and easy installation in diverse spaces. ③. Ideal for facility managers, safety officers, and property owners requiring stable emergency signaling in schools, factories, shopping malls, and office complexes. ④. Functions in crowded industrial zones, multi story buildings with sound barriers, or chemical storage areas where spark proof equipment is mandatory. ⑤. Engineered for seamless integration with existing security systems, its strong copper components and construction secure year round performance in extreme temperatures and humidity. ⑥. Component: Stainless steel, copper, ABS ⑦. Size: about 20x20cm/7.87x7.87inch ⑧. Package Includes: 1xAlarm bell ⑨. 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.