Features: 1.The trumpet is extensively applicable to truck, wagon, train, ship, vans and any other 12V vehicle to better meet your needs 2.The kit comes with five strong trumpets, a 12V heavy duty compressor, hose, relay and mounting hardware 3.This kit has all the bells and whistles you would expect from for Vixen Horns, and generates immediate attention 4.Musical air horn is chrome color, making your vehicle more special, and made of strong ABS plastic, more durable to use 5.Air trumpet set after high accuracy production and undergone extensive quality tests to strong durability and reliability. Specification: Item Type: Air Trumpet Material: ABS Chrome Plated Relay: 4-pin 12V / 30A Hose OD: Approx 3/8in / 0.95cm Trumpet Length: Approx 11in/27.94cm, 10-?in/26.67cm, 8in/20.32cm, 7-?in/19.05cm, 6in/15.24cm Trumpet Diameter: Approx 3-?in / 8.89cm Color: Chrome Voltage: 12V Application: Truck, wagon, train, ship, vans and any other 12V vehicle. Function: Strong power drives sound Better sound quality, maximum strength and durability.