Applicationall kinds of special vehicles.Specification 7 sounds style car alarm horn+microphone system kit Voltage: DC 12V Power: 100W Sound level: 110DB 7 different kinds of sounds design Condition: Brand NewWarranty: one year warranty for any manufacturing defect High quality easy to install You will get exactly as picture shown Package Included: 1X Horn 1X Microphone 1X Mounting Bracket As the Picture shows Wiring method: The main red line is connected to the positive electrode of the battery, the black line is connected to the negative pole. Note -It is an aftermarket tool, it serves as a replacement of the original parts -Instructions are not provided. We recommend a professional installation. -If you have any questions, please feel free to contact us.