Fitment: For Cars, SUV, Truck, RV, Marine and more. For all vehicles with a 12V system.(on-board air system is required) Features: -Powerful quad trumpet train air horn produces a loud roaring sound. -Easy to install. The horn comes with a 12V solenoid, includes basic mounting hardware. -Made of plated zinc, to ensure maximum strength and durability for long lasting usage and against all weather conditions. -Designed for customers looking for a loud and affordable air horn. Specification: DB output: 135db Color: Silver/Black Material: zinc alloy Voltage: 12V Trumpets: 13-" L, 11-" L, 9" L, 7-" L x 3-" D Packing Included: 1 x Quad Trumpet (In-line) Train Air Horn 1 x 1/4" OD Nylon Plastic Hose (6 Feet) 1 set Mounting Hardware Note: - An on-board air system is required for operation. - No Installation Instructions Included, ofessional installation is recommend. - This kit may require additional parts such as wiring, relays, switch, and hardware. - Each installation is custom depending on the application. - Connected directly to the battery relay. - If you have not connected the horn relay, may cause electrical problem. - It is recommended to use 20A-30A fuse. - Mounting angle downward,so that moisture can not collect in the horn. - If no sound or strange sound,check the horn wire (+/-). - Connect the grounding cable to avoid spark. - Disconnect the ground cable first remove. - Be careful not to put too close to the chassis of the horn trumpet rattling noise reduction. - Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting.