This HS-150 Police Vehicle electronic siren speaker has the following characteristics: The speaker horn has low distortion, fast response speed, is waterproof, heat-resistant, corrosion-resistant, and durable. The driver unit has neodymium magnet can provide strong low-frequency soundCar alarm speaker has long life and anti aging and reliable quality Vehicle Alarm Speaker has high-quality sonorant diaphragm Strong corrosion preventive,anti-hard body impact 150 watt speaker output Weatherproof housing Clear sound frequency Built-in bracket for installation Non corrosive finish Perfect for small places Universal to all alarms Specification Model: HS-150 Input power:150W Impedance : 4/8/16 ohms Freq.Resp : 180-6000HZ S.P.L (1W/1M,1000HZ): 120 dB Dimension: 206W*133H*175L MM Horn Matrial: Plastic Back Cover:Metal Magnet : Neodymium Carton Size: 80*45*26CM