Features: This 120dB magnetic security alarm delivers triple defense against fire, theft, and quakes with its piercing alarm, powered by safe 12V for fast emergencies alerts in critical situations. Built with shock resistant ABS/metal housing and magnetic mounting, the strong alarm features seamless integration with existing detectors while requiring not professional installation. Ideal for homeowners, business operators, and property managers seeking comprehensive defense for residences, offices, retail stores, or apartment complexes. Strategically install near entry points like doors/window or pair with detectors in hallways to create layered security across living spaces and commercial premises. Engineered through rigorous stress testing, this maintenance easy alarm systems ensures year round reliability, offering expandable defense capabilities through sensors internet compatibility. Specifications: Component : ABS, Metal Size: about 52x50mm/2x1.97inch Working electric : 12V Package Includes: 1xMagnetic Security Alarm 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.