Feature: 1. Premium Material: Made of sturdy, heat proof material, the electric motor siren is not easy to deform. Surface spray painting ensures rustproof and durability. 2. Pure Copper Motor: Featuring premium pure copper motor, the sound alarm siren reaches up to 10,000 rotations per seconds, providing stable and efficient operating for extended lifespan. 3. Volume Enhancement: The buzzer sound alarm siren integrates aerodynamic technology and dynamic balance calibration, effectively converting wind energy into sound energy to increase volume. 4. Sound Amplification and Heat Dissipation: The wide heat dissipation amplification port not only diffuses heat effectively but also amplifies the sound to make it carry farther. 5. Versatile and Practical: Easily transfer sound signal over long distances with the siren's high volume and clear sound quality, suitable for factory, school, entertainment venue, ranch, home. Specification: Item Type: Electric Motor Alarm Siren Material: Iron, Aluminum Alloy, Copper Size: Approx. 198 x 135mm / 7.8 x 5.3in Mounting Hole Distance: Approx. 120mm / 4.7in Frequency: 50/60Hz Sound (A)1m: 125dB Insulation Resistance: 100MΩ(at 500 VDC) Dielectric Strength: 500VAC, 50/60Hz in 1 minute Guard Rating: IP44 Application: Suitable for Factory, School, Entertainment Venue, Ranch, Home Security Weight: Approx. 1510.00g / 53.26oz . Package List: 1 x Electric Motor Alarm Siren