Description: Fits for Car Truck Train SUV VAN Boat Motorcycle. Single Trumpet Electric Pump air train horn with glistening black finishing. 150 decibels sound, super loud. Small size but powerful volume and tuned train horn sound. Easy to installation only need to simply mounted on your air compressor. Great sound quality, extremely stable frequency. Long service life, reliable working performance. Specification: Color: Chroming Material: Plastic+Iron+Aluminum Decibel: 150db Voltage: 12V Overall Size: Approx. 445x100x95mm/17.5x3.9x3.7inch Current: 18A Package Includes: 1 Piece Trumpet 1 Piece Motor 2 Pieces Brackets 1 Piece Pipe 1 Piece Motor bolt nut 3 Pieces Screws Note: Professional installation is highly recommended if you have any difficult in installation The positive and negative poles of the power supply are respectively connected with the two wires on the solenoid valve(no positive or negative points) The air tap on the solenoid valve is connected to the gas source of the vehicle(make sure no air leak)