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Note: Please place the microphone behind the horn. (Keep at least 1 meter distance to prevent interfering noise.) And don't make them face to face when you use Fitment: Color: black Power: 100W Voltage: DC12V Fit for most of cars, vans, trucks, motorcycles, mopeds Red wire connects to 12V power supply positive Black wire connects to 12V power supply negative High strength shell, waterproof, corrosion-resistant Including microphone, can work as a PA system Pure and super loud sound, can shout out your own voice by pressing the side key 5 different kinds of sounds: siren, alarm, yelp, fire, wail Package Included: 1X Horn 1X Microphone 1X Mounting bracket Necessary hardware included Instruction: not included