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