*Plug and Play *Loud and clear sound *Low power consumption and high performance *Simple installation the same as the normal horn *Durable with fixing bracket waterproof cover *Suitable horn loud beautiful appearance our horn features an extremely powerful directly injected mini-compressor paired with a patented snail design to really charge and amp up the sound! all integrated into one small but powerful device! there is no bulky air compressor, only a small device that produces incredible sound! its so compact, almost half of our customers buy and install 2 horns for double the loudness!