Features: Audio Clarity and Audibility: Voltage: 12V Power:20W Sound Level:120dB. As the pa system for cars is equipped with a powerful host and speaker, sounds can be heard from the distance. The alarm system is designed with sirens of 5 or 7 kinds, such as those of ambulances, for police for cars, fire trucks, etc. They will meet your needs to handle various situations. The siren speaker is easy to install on your vehicle if you follow the instruction below. It takes minutes to connect wires. The pa speaker is fit for all kinds of specific vehicles, including for police for cars, fire trucks, ambulances and private for cars. Power siren with 12V for DC or car battery. Specifications: Material:ABS Type:5 Sound,7 Sound,Wood Color,Black Color,Record Horn Size:Approx.15.9x17.1x9.4cm or 6.26x6.73x3.7om Net Weight:700g Package Includes: 1Set Car Warning Alarm note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.