Features： 1、Universal Horn Kit: Our Air speaker kit is suitable for any 12V car truck train boat van, you will receive 2 music speakers, 1 12V compressor, 1 relay, as well as installation instructions and all mounting accessories. 2、Super Loud: The air horn can produce a powerful train sound of 120DB, issuing a warning that cannot be ignored, please do not use near schools, hospitals, residential areas. 3、Upgraded Air Compressor: Our compressor uses larger coil, premium material, which can create stronger air pressure, make the air horn louder and clearer. 4、Bright Red Appearance: The bright red design of the horn housing not only adds to the stylish atmosphere of the vehicle, but also improves the visibility of the horn, making you more noticeable on the road. 5、Durable Materials: Air horns for trucks are made of durable materials with advanced relays and wiring harnesses, wear resistant, all kits are designed strictly. Specification： Item Type: Dual Trumpet Air Horn Voltage: 12V Current: 20A Decibel: 120db Fitment: Universal, e.g. for Truck Train Boat Car Package List： 2 x Air Horn 1 x Compressor 1 x Relay  1 x Instructions  13 x Mounting accessories