The Model 810 and the Model 815 offer the same powerful big rig roof mount air horn sound. These models only differ in the way they are activated: Model 810, electric solenoid and Model 815, manual lanyard. Both models of Challenger come complete with a maintenance free on board air system. Each of the kits include everything that is needed to install on any 12-volt vehicle: a deluxe air horn that is all metal with triple chrome plated trumpets, heavy duty compressor, tank, hoses, mounting hardware, and instructions. All moving parts of the air compressor are manufactured to precision tolerances. The compressor's motor is computer balanced, reducing noise and vibration. The trumpets are built on a heavy mounting base that secures to the vehicle using four rust-resistant stainless steel bolts. Kit also comes with 20' of plastic coiled hose with air fittings to inflate shocks, rafts or any other application requiring air. All necessary mounting hardware, hose and fittings included. Spanish instructions included.