Description: Fits for Car Truck Train SUV VAN Boat Motorcycle. 5-Trumpet Electric Pump air train horn with glistening black finishing. 130 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: Silver Material: Plastic+Iron+Aluminum Decibel: 130db Voltage: 12V Size: Approx. 272x85x85mm/11x3.3x3.3inch Approx. 258x85x85/10x3.3x3.3inch Approx. 220x75x75/8.7x3x3inch Approx. 200x75x75/7.9x3x3inch Approx. 165x72x72/6.5x2.8x2.8inch Current: 25A Package Includes: 5 Pieces Trumpets 1 Piece Motor 1 Piece Relay 5 Pieces Base Mounts 1 Piece Pipe 5 Pieces Motor bolts nuts 1 Piece Motor Bolt Nut Gasket 10 Pieces Pipe Base Mounts 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)