BACAI 12V/24V 150DB Black Metal Triple Trumpet Compact Air Horn Kit Ultra Loud for Truck Train Easy installation, simply mounted on your air compressor. Requires air compressor and tank (not included). Direct fits any 12V/24V vehicles or trains/trucks. Professional installation is highly recommended. We send it within 1-2 working day, it will take 7-15 working day to receive the item.